GCSE Physics

Electrical Power

Electrical power is a tricky one. It's important to understand what power means: energy transferred in a given time. Its units are usually J/s which is abbreviated to W (watt).

Look at the circuit below. The cell is the energy source - it transfers energy from chemical potential energy into electrical energy.
cell and a lamp in series

The lamp is an energy user, changing electrical energy into other forms: heat and light.

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