Potential difference

A chemical cell converts energy stored in chemicals into electrical energy. Its chemical reactions create a potential difference, or voltage, between two electrodes. If the electrodes are joined through a complete external circuit, this potential difference drives electrons through the wire and can operate a device.

A chemical cell uses a chemical reaction to produce a potential difference (p.d.) between two electrodes. Potential difference is measured in volts (V). It is what can drive an electric current when the electrodes are connected by a complete external circuit.

A chemical cell uses chemical reactions to produce a potential difference, or voltage, between two electrodes. This potential difference can drive charge through a complete external circuit, transferring energy to a component such as a lamp or motor.