Physics (AS & A Level) · Feb / March 2017 · Paper 12 · Question 16

The total energy input E_in in a process is partly transferred to useful energy output U and partly transfered to energy that is wasted W. What is the efficiency of the process?

1. A\frac{U}{E_{in}} \times 100\%
2. B\frac{W}{E_{in}} \times 100\%
3. C\frac{U}{W} \times 100\%
4. D\frac{U+W}{E_{in}} \times 100\%

As printed in the paper