Physics 9702 · AS & A Level · Energy conservation

Energy conservation — practice question

Power is passed through a machine, as shown. What is the machine’s efficiency?

  • A$\frac{P_I}{P_O + P_L}$
  • B$\frac{P_L}{P_I}$
  • C$\frac{P_L}{P_O}$
  • D$\frac{P_O}{P_I}$

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