| Capacitors |
| Component | Circuit Symbol | Function of Component |
| Capacitor |  | A capacitor stores electric charge. A capacitor is used with a resistor in a timing circuit. It can also be used as a filter, to block DC signals but pass AC signals. |
| Capacitor, polarised |  | A capacitor stores electric charge. This type must be connected the correct way round. A capacitor is used with a resistor in a timing circuit. It can also be used as a filter, to block DC signals but pass AC signals. |
| VariableCapacitor |  | A variable capacitor is used in a radio tuner. |
| Trimmer Capacitor |  | This type of variable capacitor (a trimmer) is operated with a small screwdriver or similar tool. It is designed to be set when the circuit is made and then left without further adjustment. |
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