http://www.pcworld.com/article/2018970/ipad-family-aces-battery-tests-while-android-tablets-lag.html
Overview:
Over the course of this week, I learned about electrostatics (the movement of electrons) and voltage (the measurement of electricity). We had an assignment that asked us to place a comb next to a thin stream of water. We had previously used the comb to comb our hair, which gave it a charge. The comb forced the water to move closer to it, proving that we had charged the comb.
-After the Lemon Battery Lab I got a true feeling for what voltage is. It's simply Electric Potential Energy. Also, when solving equations regarding electrostatics, voltage = height. Voltage is essentially building up this big mountain of energy (which is why it is similar to height), which then gets transfered into other things. An example would be the "mountain of energy" that you built up and transfered when you combed your hair and put it up near the stream of water.
-This analogy on voltage can be applied to iPad batteries too. The newer iPads have much larger batteries, making them more powerful and giving them a longer lifespan. What the larger battery is doing is just creating a larger "mountain of energy" that is used to power the various apps and programs that are running on your iPad.
