Physics 9702 · AS & A Level · Energy conservation

Energy conservation — practice question

Power is passed through a machine as illustrated. What is the efficiency of the machine?

  • 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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