For a given voltage a capacitor will store a certain amount of charge.

电容会在一个给出的电压值下储存一定的电荷。

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Simply put, a capacitor stores an electrical charge between two conductive plates separated by an electrical insulator.

简单地说，一个电绝缘体隔开两片导电板，而电容器在导电板间储存电量。

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And remember that in a capacitor, negative charge builds on one side and positive charge builds on the other.

还有在电容中，也使正电荷在一侧，负电荷在另一侧。

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The better the insulator, the more charge a capacitor can hold.

ECONOMIST: Combinatorial chemistry

As eardrum vibrations naturally create a usable voltage from brain signals, the prototype can build enough charge in a capacitor to drive a very low-power wireless transmitter that relays the electrochemical properties of the ear and potentially diagnoses balance or hearing problems.

ENGADGET: MIT ear-powered wireless sensor sustains its charge through sound

By storing excess electrical energy that is generated by the dynamo in a capacitor, and getting the spring to unwind only when the capacitor charge falls below a certain threshold, it has proved possible to extend the playing time of the second-generation radio to about an hour.

ECONOMIST: Clockwork technology