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This lesson covers the domestic use of energy, including power, energy calculations, kilowatt-hours, and reducing energy use in the home, as required by the Edexcel GCSE Physics specification (1PH0), Topic 3: Conservation of Energy. You need to be able to calculate energy costs and evaluate energy-saving measures.
Power is the rate at which energy is transferred (or the rate at which work is done). It tells you how quickly a device transfers energy.
P=tE
Where:
Exam Tip: Always check whether the question gives power in watts or kilowatts, and time in seconds or hours. Convert to consistent units before calculating.
| Find this | Equation |
|---|---|
| Power | P=tE |
| Energy | E=P×t |
| Time | t=PE |
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