Chemical cell

A chemical cell uses a reaction to produce a voltage between two electrodes. One way to make a simple cell is to put two different metals, such as zinc and copper, into an electrolyte. The metals must not touch.

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.