Topic Summaries

Power

GCSE > Physics > WJEC > GCSE Physics Topic Summaries > Energy and power > Power
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Charge, current, and electric fields

Pressure

Light, colour, and ray diagrams

Science skills: Measuring results

  • Power is the rate at which energy is transferred or at which work is done.
  • Power is measured in Watts, W.
  • One Watt is the power that would transfer one Joule of energy in one second.
  • The power of a process can be calculated as energy transferred ÷ time or work done ÷ time.
  • This can be written as \(P=\dfrac{E}{t}\) or \(P=\dfrac{W}{t}\) where:
    • \(P\) is the power in W
    • \(E\) is the energy transferred in J
    • \(t\) is the time taken in s
  • If two processes transfer the same amount of energy, then the one that completes the process in less time has a greater power.

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