|
|
» » » Working principle of capacitor(III)

# Working principle of capacitor(III)

Views: 8     Author: Site Editor     Publish Time: 2018-03-09      Origin: Site

Capacitance unit method

The unit of capacitance is the law. Capacitors of capacity 1 can store 1 Coulomb at a voltage of 1 volt. 1 Coulomb is 6.25e18g 6.25g 10 ^ 18, or 6250 trillion) electrons. An ampere represents the rate at which an electron flows through a Coulomb electron per second, so capacitors of capacity 1 can store electrons of 1 ampere-second at a voltage of 1 volt.

1 method capacitors are usually quite large. Depending on the voltage tolerance of the capacitor, it may be as big as a canned tuna bottle or a 1 liter soda bottle. Therefore, the capacitors you see are usually measured in micrometers (1/1000000).

To understand exactly how big the 1 method is, you might as well extrapolate it like this

A typical alkaline AA cell stores about 2.8 ampere-hour power.

This means that an AA battery can generate an hour of 2.8 amperes (about 4.2 watts-hours) at a voltage of 1.5 volts. That is, an AA battery can keep a 4-watt bulb under constant illumination for a little over an hour.

For ease of calculation, we simply count the voltage of the AA battery at 1 volt. To store the energy of an AA battery in a capacitor, use a capacitor with a capacity of 3600 / 2. 8 / 10 / 080, as 1 ampere-hour is equivalent to 3600 amperes / s.

If one capacity needs to be stored in a capacitor the size of a tuna can bottle, then the volume of an AA battery is nothing compared to the size of a capacitor that stores 10,080! Obviously, it is impractical to use capacitors to store large amounts of energy unless they have a high voltage tolerance.

The difference between a capacitor and a battery is that the capacitor can instantly release all of its power, while the battery takes several minutes to fully release its power. That's why the electronic flash on the camera uses a capacitor: the battery charges the flash capacitor in seconds, and the capacitor releases the entire amount of power it stores into the flash tube almost instantly. This can make rechargeable capacitors extremely dangerous, so flash lights and televisions have warning messages warning people not to open them at will. They all contain large capacity capacitors that can cause fatal damage to the human body.