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Electric current is caused by moving electric charges. The effects of charge and electric fields can be investigated by looking at the forces they exert on conductors and insulators.

Electrical current transfers energy around circuits. There are two types of current: direct and alternating.

Ohm’s Law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions, such as temperature, remain constant.

Learn how to calculate resistance in series and parallel circuits, and how resistance depends on length of conductor.

Electricity can flow either as direct or alternating current, and is used in homes to power electrical appliances.