Physics A-Level
Power
What Power means in Physics A-Level, as defined for AQA, OCR.
Definitions of Power
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Reference: OCR
The rate at which work is done or energy is transferred, defined as the work done W divided by the time taken t, so P = W/t.
The energy transferred per second, found from ṁc∆θ where ∆θ is the temperature rise between inlet and outlet.
Energy transferred per unit time, so P = ΔE ÷ t links these calculations to rates of heating.
Topics that use Power
- Thermal energy transfer (A-level only) (AQA A-Level)
- Power (OCR A-Level)
Related terms
- Change of state
- Conservation of energy
- Efficiency
- Energy transfer by heating and work
- First law of thermodynamics
- Force and motion
- Ideal gas
- Internal energy
Using Power in the exam
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