A-Level Physics Specification

OCR A H556

Section 3.3.3: Power

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#3.3.3a

power; the unit watt; \(P = \dfrac{W}{t} \)

#3.3.3b

\(P = Fv \)

Learners will also be expected to derive this equation from first principles.

#3.3.3c

efficiency of a mechanical system;

\(\text{efficiency} = \dfrac{\text{useful output energy transfer}}{\text{total input energy}} ×100\%\)