Note AcademyNote Academy
Start

Physics (AS & A Level) · Oct / Nov 2017 · Paper 11 · Question 16

9702Energy conservation

Power is transferred through a machine as shown. [diagram: machine with power input P_I, power output P_O, power loss P_L] What is the efficiency of the machine?

  1. A\frac{P_I}{P_O + P_L}
  2. B\frac{P_L}{P_I}
  3. C\frac{P_L}{P_O}
  4. D\frac{P_O}{P_I}

As printed in the paper

Show the answer

Correct answer: D. \frac{P_O}{P_I}

Sit this whole paper →More on Energy conservation

Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.