A Capacitor
A capacitor is a component that stores charge. It consists of two metal or conducting plates separated by air or an insulator known as a dielectric. When a capacitor is connected to a cell or battery, one plate loses charge and becomes positive with a charge of +Q and the other gains the charge of -Q, so that the charge stored on the capacitor is Q.

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More in Capacitors
- Charging a Capacitor and Constant Current
- Capacitance
- Use of Capacitors
- Energy Stored in a Charged Capacitor
- Measuring the Energy Stored in a Charged Capacitor.
- Energy stored in a Thundercloud
- Discharging a Capacitor through a Fixed Resistor
- Exponential Decay.
All 12 lessons in Capacitors · All AQA A-level Physics topics