The input power to a television is ${P_{in}}$. The useful sound and light power emitted by the television is ${P_{out}}$.
What is the efficiency of the television?
$\frac{P_{\text{out}}}{P_{\text{in}}}$
2 )
$\frac{P_{\text{in}} - P_{\text{out}}}{P_{\text{in}}}$
3 )
$\frac{{{P_{in}}}}{{{P_{out}}}}$
4 )
$\frac{{{P_{out}}}}{{{P_{in}} - {P_{out}}}}$
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