Physics (AS & A Level) · Oct / Nov 2023 · Paper 11 · Question 16
The input power to a television is Pin. The useful sound and light power emitted by the television is Pout. What is the efficiency of the television?
- A$\dfrac{P_{out}}{P_{in}}$
- B$\dfrac{P_{in}-P_{out}}{P_{in}}$
- C$\dfrac{P_{in}}{P_{out}}$
- D$\dfrac{P_{out}}{P_{in}-P_{out}}$
As printed in the paper
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Correct answer: A. $\dfrac{P_{out}}{P_{in}}$
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