Capacitor is just like a battery that stores electrical energy, but it doesn't work in the way battery does. A battery has cathode and andoe, one side produces electrons while the other side takes them back in, but capacitor does nothing like this. Instead, the capacitor can only store electrons. That is why it is called capacitor. All capacitors are made in the same way. They are made of at least two conductors separated by a non-conductor. Whenever there is a battery or other power source that can create a voltage difference on two sides of the capacitor, positive charges will be collected on one plate and while the negative charges will stay on the other plate. Energy is stored in an electrostatic field and once they are stored, the capacitor will have the same voltage as the battery/power source. For example, if the battery has 3.6v, then the capacitor will get 3.6v once being charged. Some capacitor does have a huge capacity and they can store up enough energy that can power a light bulb for a short time like a minute or so. The flashlight in the camera works this way by the way. That is why you have to wait a while until the camera can do another flash. The time you wait is the time the capacitor charges itself up using the battery. Different from resistors, the codes on a capacitor are not color codes. Instead, they are numbers. The first two digits are read as "Pico-Farads". While the last digit (sometimes does not exist) is the multiplier, basically telling how many zeros should be added after the first two digits.
  • Subject : Science
  • Topic : Physics
  • Posted By : Jason
  • Created on : 07-28-2011

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