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​​What is Air Quality Index (AQI)?

The Air Quality Index (AQI) is a system used to measure and report the quality of the air in a specific area. It’s designed to help people understand how polluted the air currently is or how polluted it is forecast to become.
It's like a yardstick that runs from 0 to 500, with higher numbers indicating greater levels of air pollution and health concern. An AQI of 50 or below is considered good, while an AQI above 300 is considered hazardous.
The AQI takes into account five major air pollutants: ozone, particulate matter (PM2.5 and PM10), nitrogen dioxide, sulfur dioxide, and carbon monoxide. Each pollutant has specific health effects, and the AQI considers the pollutant with the highest concentration to determine the overall air quality.
The AQI is divided into six categories, each with a corresponding color code:

Good (0-50): Green

Moderate (51-100): Yellow

Unhealthy for Sensitive Groups (101-150): Orange

Unhealthy (151-200): Red

Very Unhealthy (201-300): Purple

Hazardous (301+): Maroon


The AQI is a valuable tool for understanding the health risks associated with air pollution. It can help you make decisions about whether to limit outdoor activity, especially for children, older adults, and people with respiratory problems.


​​Why do airlines apply Speed Tape to their planes?
 
Airlines apply speed tape to their planes to temporarily repair minor damages to the aircraft's exterior. Speed tape is a thin, aluminum tape with a pressure-sensitive adhesive. It is designed to withstand high temperatures and wind speeds, making it ideal for use on aircraft.
Speed tape is typically used to repair small dents, scratches, or cracks in the aircraft's skin. It can also be used to cover holes or gaps in the skin. Speed tape is not a permanent repair, but it can keep the aircraft airworthy until a more permanent repair can be made.
The gaps between panels or fairings create drag if they aren't filled. The gaps also let water in, which can cause corrosion.
Normally, if they aren't removable panels that get opened all the time, they are sealed using a rubber compound called PRC to make a fillet seal. The PRC takes a while to cure, so sometimes if a plane flies, the sealant will be covered with speed tape to stop it from getting damaged before it sets. Or the seal will be temporarily made with just tape.
Or sometimes little fairings, bits of plane skin that are not structural, fall off or get damaged, and tape is used to replace them.


​​What are the differences between an Ocean, a Sea, a Bay and a Gulf?

The term “ocean,” as defined by Merriam-Webster, is ”the whole body of saltwater that covers nearly three-fourths of the surface of the earth.” Comprising 1.3 billion cubic kilometers of water, this is the global body of water that covers roughly 71% of the earth. We often hear and speak of the ocean as it’s divided into five components: Arctic, Atlantic, Indian, Pacific and Southern (Antarctic). While these are often referred to as individual oceans (plural), there is no real barrier separating them. Because these are all connected, there is truly only one ocean (singular).
generally “sea” does refer to a smaller segment of the ocean, there are different types of seas in geology: marginal and inland. A marginal sea is one that is defined by its proximity to the land that surrounds it, such as the Mediterranean Sea, the Black Sea or even the Gulf of Mexico (more on that in a minute). Alternatively, an inland sea, while also shallow, is—you guessed it—more inland and covers part of a continent. These are also sometimes called epeiric or epicontinental seas. Epeiric or inland seas have changed throughout periods of time as the earth has evolved, but they are typically landlocked and connect to the broader ocean through a very small channel. Modern-day examples of these include the Baltic Sea and the Hudson Bay.
Both bays and gulfs are also part of a sea or ocean. A bay is a broad, recessed coastal inlet where the land curves inward. There is a coastline on three sides of a bay. A gulf is a more defined and deeper inlet with the entrance more enclosed than a bay.


​​What is a Hypnic Jerk?

A hypnic jerk, also known as a sleep start or a hypnagogic jerk, is an involuntary muscle spasm or twitch that occurs just as a person is falling asleep. It is a common phenomenon experienced by many people and is generally harmless.

Hypnic jerks typically manifest as sudden, brief muscle contractions that can involve various parts of the body, such as the arms, legs, or torso. They often cause a sensation of falling or a "jolt" that can briefly wake a person up. These jerks can be accompanied by a feeling of unease, a rapid heartbeat, or a quickened breathing rate.

While the exact cause of hypnic jerks is not fully understood, several factors are believed to contribute to their occurrence:

Muscle relaxation: As you transition from wakefulness to sleep, your muscles start to relax. The sudden relaxation of muscle groups can trigger a reflexive jerk.

Brain activity: The brain's electrical activity changes during the transition from wakefulness to sleep. Some researchers believe that hypnic jerks could be related to irregularities in this brain activity.

Fatigue and stress: Fatigue, sleep deprivation, and high levels of stress have been associated with an increased likelihood of experiencing hypnic jerks.

Caffeine and stimulants: Consumption of stimulants like caffeine close to bedtime may increase the likelihood of experiencing hypnic jerks.

Hypnic jerks are generally harmless and do not require medical treatment. However, if they consistently disrupt your sleep or cause significant distress, it may be helpful to practice good sleep hygiene, such as establishing a regular sleep schedule, creating a relaxing sleep environment, and managing stress levels. If you have concerns about your sleep or experience any unusual symptoms, it's always a good idea to consult with a healthcare professional for guidance and further evaluation.


​​Why are Stones/Gravel laid in Switchyard?

Grit and gravel are laid in switchyards for a variety of reasons. Firstly, they are used to facilitate drainage. Switchyards are exposed to various weather conditions, and the layer of grit and gravel allows water to percolate through the ground quickly. This helps prevent the accumulation of water, reducing the risk of equipment malfunctions, corrosion, or electrical hazards.

Secondly, grit and gravel enhance grounding in switchyards. They provide a conductive layer that improves the conductivity of the soil. This allows fault currents to flow effectively through the ground, reducing the risk of electrical shocks and ensuring the safe dissipation of fault currents.

Thirdly, they help control erosion. Switchyards are often situated in open areas, and grit and gravel stabilize the ground, preventing soil erosion caused by wind, rain, or water runoff. This ensures the stability of the switchyard infrastructure.

Fourthly, grit and gravel act as a fire-resistant layer. In the event of a fire caused by equipment failure or electrical faults, they help contain the flames and prevent them from spreading to other areas of the switchyard. This reduces the risk of damage to valuable equipment and enhances overall fire safety.

Lastly, grit and gravel provide a stable surface for workers to access the switchyard and perform maintenance tasks. They offer traction for vehicles and equipment, ensuring safe movement within the switchyard premises. This accessibility facilitates regular inspections, repairs, and maintenance activities.


​​Why are no metallic items allowed to be worn inside an MRI room?

An arm MRI (magnetic resonance imaging) scan uses strong magnets to create pictures of the upper and lower arm. This may include the elbow, wrist, hands, fingers, and the surrounding muscles and other tissues.
For the MRI exam, the patient is placed inside of the MR system or scanner—typically a large donut-shaped device that is open on both ends. The powerful magnetic field aligns atomic particles called protons that exist in body tissues that contain water. The applied radio waves then interact with these protons to produce signals that are picked up by a receiver within the MR scanner. The signals are specially characterized using the rapidly changing magnetic fields. With the help of computer processing, cross-sectional images of tissues are created as "slices" that can be viewed in any orientation.
As a patient, it is vital that you remove all metallic belongings in advance of an MRI examination, including external hearing aids, watches, jewelry, cell phones, and items of clothing that have metallic threads or fasteners. Additionally, makeup, nail polish, or other cosmetics that may contain metallic particles should be removed if applied to the area of the body undergoing the MRI examination.
The powerful magnetic field of the MR system will pull on any ferromagnetic object in or on the patient’s body such as a medical implant (e.g., certain aneurysm clips, medication pumps, etc.). Therefore, all MRI facilities have comprehensive screening procedures and protocols they use to identify any potential hazards. When carefully followed, these steps ensure that the MRI technologist and radiologist know about the presence of any metallic objects so they can take precautions as needed.


​​Why does Nose plug up when we cry?

To understand why your nose plugs up, you first have to understand how tears work. Tears are produced all the time, not just when you cry. Their job is to keep your eyeballs clean and moist. They also protect your eyes from germs.

Tears are produced by a lacrimal (LAK-rih-mul) gland above your eye. Openings in this gland carry the tear fluid to the top of your eyeball. When you blink, your eyelid spreads tears over the surface of your eye. Any extra fluid flows to a lacrimal sac near the inner corner of your eye. From there, the fluid drains into your nose. The amount is so small that you usually don't notice it.

When you cry, however, a large amount of tears is produced. The lacrimal sacs can't drain your tears fast enough. Some of them spill over your eyelids and down your cheeks. The remaining tears flood the sacs and your nose, causing it to "run" or feel plugged up. You can empty these tears by blowing your nose after crying. This also is why sometimes when you have a cold, your eyes "water" or tear, especially when you blow your nose.


​​​​What is Pulse Oximeter? How does it work?

Pulse Oximeter is a non-invasive and painless test that measures your oxygen saturation level, or the oxygen levels in your blood. It can rapidly detect even small changes in how efficiently oxygen is being carried to the extremities furthest from the heart, including the legs and the arms.
The Pulse Oximeter is a small, clip-like device that attaches to a body part, like toes or an earlobe. It’s most commonly put on a finger, and it’s often used in a critical care setting like emergency rooms or hospitals. Some doctors, such as Pulmonologists, may use it in office. All pulse oximeter probes (finger or ear) have light emitting diodes (LEDs) which shine two types of red light through the tissue. The sensor on the other side of the tissue picks up the light that is
transferred through the tissues.
The oximeter can determine which of the haemoglobin is in pulsatile blood (arterial) and can then determine the SpO2 of arterial blood in the peripheral circulation.


​​Why do Airplanes fly in a curve instead of straight forward?

Airplanes typically fly in curved paths for two main reasons: efficiency and safety.
Efficiency: Aircraft follow curved flight paths to take advantage of the Earth's rotation and the natural wind patterns in the atmosphere. The Earth rotates from west to east, causing the air to move with it. This phenomenon is known as the Coriolis effect. By flying in a curved path, aircraft can take advantage of the prevailing winds, which can significantly reduce fuel consumption and travel time. These wind patterns are often referred to as jet streams. Pilots and airlines carefully plan routes to utilize these favorable winds, resulting in more efficient flights.

Safety: Another reason for flying in curved paths is safety. Air traffic control systems are designed to manage the flow of aircraft efficiently and prevent collisions. By following predetermined routes and flying in designated airways, pilots can maintain separation from other aircraft, minimizing the risk of mid-air collisions. These airways are carefully planned to ensure safe distances between aircraft, and they often follow curved paths to facilitate this separation.

While airplanes may appear to fly in straight lines when viewed from the ground, their flight paths are typically a series of connected curved segments. This allows them to optimize their routes for efficiency, taking into account the Earth's rotation and wind patterns, while still ensuring safety by adhering to established air traffic control procedures.


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On the wonderful occasion of New Year, we take this as an opportunity to thank you for bestowing your trust in us. Wishing you a prosperous New Year and success always!

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​​What are Eye Floaters and Flashes?

Eye floaters and flashes are common visual phenomena that can occur due to changes in the gel-like substance within the eye called the vitreous humor. While they can be bothersome, they are usually harmless. Here's an explanation of each:

Eye Floaters: Floaters are tiny specks, spots, or strands that appear to float across your field of vision. They are most noticeable when looking at a plain background, such as a blank wall or the sky. Floaters are actually tiny clumps of gel or cells within the vitreous humor that cast shadows on the retina (the light-sensitive tissue at the back of the eye). They can appear as dots, circles, lines, or even cobweb-like shapes. Floaters are more common as you age, as the vitreous humor tends to become more liquid and can form small clumps.

Flashes: Flashes are brief, flickering sensations of light that can occur in the peripheral (side) vision. They may appear like lightning streaks or camera flashes. Flashes occur when the vitreous gel tugs or pulls on the retina, stimulating the light-sensitive cells. This can happen during normal eye movement or due to jarring movements, such as a blow to the head. Flashes may also be associated with other conditions, such as retinal detachment or posterior vitreous detachment, which require prompt medical attention.

The occurrence of eye floaters and flashes is mainly attributed to age-related changes in the vitreous humor. The gel-like substance can become more liquefied and develop small pockets or clumps over time. These clumps cast shadows on the retina, leading to the perception of floaters. As the vitreous humor undergoes changes, it can also exert traction on the retina, causing the sensation of flashes.

Other factors that may contribute to the development of floaters and flashes include:

- Eye injuries or trauma
- Eye inflammation or infection
- Diabetic eye disease
- Nearsightedness (myopia)
- Cataracts or cataract surgery
- Retinal tears or detachments


​​What is Muscle Fatigue?

At the start of exercising or when performing tasks, your muscles feel strong and resilient. However, over time and after repeating movements, your muscles may begin to feel weaker and tired. This can be defined as muscle fatigue.

Muscle fatigue is a symptom that decreases your muscles’ ability to perform over time. It can be associated with a state of exhaustion, often following strenuous activity or exercise. When you experience fatigue, the force behind your muscles’ movements decrease, causing you to feel weaker. Exercise and other physical activity are a common cause of muscle fatigue. Other possible causes of this symptom include: Addison’s disease age, anemia, anxiety, cerebral palsy, chronic fatigue syndrome (CFS), dehydration, depression, hepatitis C, HIV, influenza (the flu), lack of exercise, lactic acid production, medications, mineral deficiency, muscular dystrophy, myositis (muscle inflammation), poor muscle tone due to a medical condition, pregnancy, sleep deprivation, stroke, etc.

Muscle fatigue can occur anywhere on the body. An initial sign of this condition is muscle weakness. Other symptoms associated with muscle fatigue include: soreness, localized pain, shortness of breath, muscle twitching, trembling, a weak grip, muscle cramps. If you begin having difficulty performing daily tasks or if your symptoms worsen, seek immediate medical attention. This could be an indication of a more serious health condition.


​​What is Faraday Clothing?

Faraday clothing, also known as EMF (electromagnetic field) shielding clothing or RF (radiofrequency) shielding clothing, is clothing designed to reduce or block the penetration of electromagnetic radiation. It is intended to provide personal protection against electromagnetic fields emitted by various sources, such as Wi-Fi routers, cell phones, power lines, and other electronic devices.

The clothing is typically made using conductive materials, such as silver or copper threads, which create a Faraday cage effect. The conductive fibers or fabrics in the clothing form a barrier that reflects or absorbs electromagnetic radiation, preventing it from reaching the wearer's body.

Faraday clothing is often used by individuals who are concerned about potential health effects associated with prolonged exposure to electromagnetic fields. However, it's important to note that the scientific consensus is that the levels of electromagnetic radiation emitted by everyday electronic devices pose no significant health risks to the general population.

It's worth mentioning that the effectiveness of Faraday clothing can vary depending on factors such as the specific fabric used, the design of the clothing, and the frequency of the electromagnetic radiation being targeted. If you are considering using Faraday clothing, it's advisable to research and choose products from reputable manufacturers that have undergone testing and certification for their shielding capabilities.


​​What is the difference between Fog, Mist and Dew?

Fog is a cloud that appears near the ground or touches the ground. Mist is a thin fog that appears near the ground. Dew is deposit of water drops that is formed on cold surfaces by condensation of water vapors in the air.
Fog, mist and dew seem to be interrelated and often create confusion when one tries to define them. There is a little difference between fog and mist. Dew basically differs in the phenomenon pertaining to its formation.
Fog is a thick cloud that remains
suspended in the atmosphere or near the surface of the Earth. Due to fog, visibility is greatly affected and it remains restricted and obscured.
To describe fog, one must be familiar with the term cloud. Cloud is a visible accumulation of tiny water droplets or ice crystals that are formed in the atmosphere of the Earth. You might have seen clouds; they vary in size, shape and color. The white appearance of cloud is due to a tight packed arrangement of water droplets in its structure.
Air, when filled with water vapor generates the clouds. Thus, fog can be simply termed as a cloud that touches the surface of the Earth. Water vapor or gas is invisible, but still one can see fog, due to the presence of water droplets in it.
Mist is same as fog; it is just less dense than fog. Fog tends to be thicker and massive than mist. Thus, both can be defined as the clouds that touch the Earth. The only difference between them is regarding the density. A fog that is thinner than mist is known as haze. Fog can also turn acidic, if tiny liquid droplets combine with gaseous impurities, such as oxides of sulfur and nitrogen.
Dew is condensed moisture that appears in the form of small drops and is found on a relatively cold surface. Radiation is responsible for cooling the objects near the Earth’s surface more rapidly. Therefore, the ground objects become cooler in comparison to the surrounding air. When this air contacts a colder surface, it cools down by the process of conduction. In the same process, it loses its ability to hold water vapors. This cooled air generates tiny droplets of condensed water vapor. They are generally found on the twigs, leaves and blades of grass. It is a major source to provide moisture to the plants. Dew, generally appears in early morning or in evening. If the temperature cools down further, then dew freezes and becomes ice, known as frost. On the other hand, mist and fog usually form at night, as the air becomes too cold to hold all its moisture.


​​What is Hydrogen Fuel?

Hydrogen fuel refers to the use of hydrogen as a source of energy for various applications. It is considered a clean and sustainable fuel because when hydrogen is consumed, the only byproduct is water vapor, making it a zero-emission energy source.

Hydrogen fuel can be utilized in different ways:
Hydrogen Fuel Cells, Hydrogen Combustion, Chemical Reaction etc
The process of obtaining Hydrogen involves different methods:
Steam Methane Reforming, Electrolysis, Biomass Gasification etc
This colourless gas is given so many colourful terms.
Green hydrogen, blue hydrogen, brown hydrogen and even yellow hydrogen, turquoise hydrogen and pink hydrogen. They’re essentially colour codes, or nicknames, used within the energy industry to differentiate between the types of hydrogen.
Depending on the type of production used, different colour names are assigned to the hydrogen. But there is no universal naming convention and these colour definitions may change over time, and even between countries.

Hydrogen fuel is a versatile and clean energy source that has gained significant attention in recent years. Here are some key uses and benefits of hydrogen fuel:

Transportation: Hydrogen fuel can be used in fuel cell vehicles, where it reacts with oxygen from the air to produce electricity, powering the vehicle's motor.

Energy Storage: Hydrogen can be used as a means of storing excess renewable energy generated from sources like wind and solar power.

Power Generation: Hydrogen can be used in fuel cells to generate electricity for various applications.

Industrial Processes: Hydrogen is widely used in industrial processes, including petroleum refining, ammonia production, and methanol production.

Heat Generation: Hydrogen can be burned directly for heat generation in applications like residential heating, industrial processes, or power generation.

Aerospace: Hydrogen has been used as rocket fuel for decades. Its high energy density and efficient combustion make it an ideal propellant for space exploration.


​​What do Astronauts eat in space?

In space, astronauts have a carefully planned and nutritionally balanced diet to ensure they receive the necessary nutrients for their health and well-being. The food provided to astronauts undergoes a rigorous preparation process to ensure safety and suitability for space travel.

Traditionally, astronauts' meals were primarily composed of thermostabilized and dehydrated foods, which had a long shelf life and were lightweight. These foods required rehydration with water before consumption. However, recent advancements in technology have allowed for more variety and improvement in the quality of space food.

The food options for astronauts include a combination of fresh, refrigerated, thermostabilized, and dehydrated items. Some examples of foods commonly consumed in space include:

Thermostabilized and dehydrated items: These include vegetables, fruits, meats, seafood, and desserts. They are specially processed and packaged to withstand the space environment and have a long shelf life.

Vacuum-sealed containers: Foods like rice, noodles, and other grains are often vacuum-sealed to increase their shelf life and prevent spoilage.

Pre-packaged meals: Astronauts have access to pre-packaged meals that are easy to prepare and consume. These meals often include a variety of dishes like pasta, chicken, beef, and fish.

Fresh produce: Astronauts now have the opportunity to enjoy some fresh produce during their missions. Resupply missions may include fresh fruits and vegetables like apples, oranges, lettuce, and carrots.

Condiments and seasonings: Salt, pepper, and other condiments are available to enhance the flavor of the meals. However, they are often provided in liquid or solid form to prevent the dispersal of loose particles in microgravity.

Astronauts' dietary needs are carefully calculated and monitored by nutritionists and space agencies to ensure they receive sufficient nutrients and energy during their time in space. Water is also crucial, and astronauts have access to specially treated and filtered water for drinking and rehydrating their meals.

It's worth noting that as our understanding of space nutrition advances, future missions may incorporate more advanced food technologies, such as growing plants or cultivating food in space, to provide astronauts with a greater variety of fresh and nutritious options.


​​What is Hawk-Eye Technology used in different sports?

Hawk-Eye, a technology, that is a computer system is used in numerous sports like cricket, tennis, football, badminton, and volleyball. It is usually used to track the trajectory of the ball and is used to display a profile of a statistical path as the moving image to take the decision over the issues that arise during when the game takes place.
The word “Hawk” itself means that something that is vigilant, watchful and has extremely keen sight.
The present study aims at using the hawk-eye technology in sports with regard to the latest trends in the sports arena. It is most commonly used in technologies in different sports. It is put up for a variety of uses like, providing a way to collect interesting statistics, to construct very suggestive visual representations of the game that is being played and helping the viewers for a better understanding of the umpire decisions. The Hawk-Eye is one of such technologies which is considered to be a really the top invention for various sports. The main idea behind its invention was to monitor the trajectory of the ball during the entire duration of the gameplay. It was developed as a replay system, originally for TV Broadcast coverage. Even the scenario of the hawk-eye invention and its use was discussed internationally, where they found it to be reliable for the decision.
Hawk-Eye is the first company to receive a FIFA Goal Line Technology (GLT) license. It is used in sports as this technology allows the officials to make quick and accurate decisions to try and interrupt play as little as possible, for making the game be played fairly.


​​What is the Fastest Bird In The World?

Flight has always fascinated us. The natural speed and agility of your average songbird is remarkable enough, but some birds take the power of flight to another level.
The fastest bird in the world is the migratory peregrine falcon. These raptors feed on other birds like pigeons and shorebirds that they capture in flight at amazing speeds of up to 200 miles per hour. They achieve this speed by diving or stooping from above, using a combination of powerful flight muscles, perfectly streamlined form, and good old gravity.

The Peregrine Falcon is the fastest bird in the world when it comes to the speed it can reach whilst diving. They can reach a staggering 200 mph (389 km/h), making them by far the fastest bird by airspeed velocity in the world. This doesn't just mean that peregrine falcons are the fastest bird in the world; they are actually the fastest animal in the world.
Peregrine Falcons utilise this impressive speed to catch their prey and perform precise manoeuvres. They may attack their prey anywhere from a few hundred metres to several kilometres away and will drop out the sky, usually using this force to deliver a significant blow to their prey. They will sometimes catch their prey with their large, powerful talons too.


​​​​What is the Gel that is applied before an Ultrasound Scan?

Ultrasound is a special form of technology that sends pulsing sound waves at a high frequency deep into the tissue of a patient using a probe or a transducer. The gel is rubbed onto the skin to help the transducer easily glide along the surface. The device can receive and also send sound waves, which then appear as images that are seen on a computer screen. A sonographer looks at the images to make sure that everything appears normal. This is done in real time and the person operating the ultrasound technology can move the transducer or the probe as required to get a fully defined picture of what’s happening beneath skin level. Screenshot images can also be taken and printed out if required.

Ultrasound gel is composed of a mix of propylene glycol and water. Propylene glycol is a synthetic product that is commonly found in hygiene, cosmetic and food products. It is quite sticky and thick. It’s important for it to have a sticky texture so that it stays on your skin and doesn’t drip off when the ultrasound is being performed.
The gel has a shelf life of approximately 5 years if the bottle remains unopened. Once opened, however, it’s recommended that it be used up within 28 days for the purpose of infection control.

Another thing that can get in the way of reducing clear images is static electricity. Ultrasound gel eliminates the static so that the procedure can be done effectively without any risk of static getting in the way.


​​Why can’t we store AC in Batteries instead of DC?

Electrical energy is not stored directly in a battery. The battery stores electrical energy in the form of chemical energy.
Imagine that an alternating current (AC) is supplied directly to a rechargeable battery, with the negative terminal of the AC source connected to the negative terminal of the battery and the positive terminal of the AC source connected to the positive terminal of the battery. The current starts flowing. But something goes wrong.
Alternating Current (AC) changes its polarities (i.e. it flows in two directions). That is, in the one-half cycle of the AC waveform, current flows in one direction, but flows in the opposite direction during the other half cycle.
During the positive half cycle of the AC, conventional current flows to the battery through Cathode, and it gets charging. But when the AC gets to the negative half cycle, the current direction reverses, thereby leading to a discharge of the battery. And so on.
In the end, the positive half cycle of the AC that is charging the battery cancels out the negative half cycle that is discharging the battery.  So, the battery does not get charged.
In fact, if the Alternating Current (AC) continues to supply the battery, it could damage it.
To prevent the discharge of the battery caused by the negative half cycle of the AC, the battery terminals would have to be changed as the AC alternates from Positive to Negative half cycle. That is, the battery terminals would have to change as the AC changes. This will have to be done at the same frequency as the AC.
It means,if the frequency of the AC is 60Hz, the battery terminals would have to be changed 60 times in one second. Do you think this is possible? Not at all. Or probably not yet.

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