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Formula: **Capacitance (Definition)**

$$C ~=~ \frac{Q}{U}$$
$$C ~=~ \frac{Q}{U}$$
$$U ~=~ \frac{Q}{C}$$
$$Q ~=~ C \, U$$

## Capacitance

`$$ C $$`Unit

`$$ \mathrm{F} $$`

The capacitance indicates how much electrical charge is separated on two bodies and what voltage is present between these bodies. For example, in a plate capacitor, the capacitance indicates how many charges must be separated on the electrodes so that a voltage of one volt is present between the two electrodes. The capacitance is therefore a measure of how well a capacitor can 'store' electric charge.

The capacitance \(C = 1 \, \mu\mathrm{F}\) means that the capacitor can 'store' \(Q = 1\,\mu\mathrm{C}\) of charge when a voltage of one volt is applied.

## Voltage

`$$ U $$`Unit

`$$ \mathrm{V} $$`

Voltage between two bodies, for example between two electrodes of a plate capacitor.

## Electric charge

`$$ q $$`Unit

`$$ \mathrm{C} $$`

Amount of charge sitting on a body, for example on the electrode of a plate capacitor.