Spec 1PH0
Revise Edexcel GCSE Physics 10.3.5 Electrical power with the question bank and revision guides.
Describe power as the energy transferred per second and recall that it is measured in watt. • Recall and use the equation: power (watt, W) = energy transferred (joule, J) ÷ time taken (second, s); P = E ÷ t. • Explain how the power transfer in any circuit device is related to the potential difference across it and the current in it. • Recall and use the equations: electrical power (watt, W) = current (ampere, A) × potential difference (volt, V), P = I × V; electrical power (watt, W) = current squared (ampere², A²) × resistance (ohm, Ω), P = I² × R.
