A $2\, W$ carbon resistor is color coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is .............. $mA$
JEE MAIN 2019, Medium
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By colour coding,
${\mathrm{R}=50 \times 10^{2}\, \Omega} $
${\mathrm{I}^{2} \mathrm{R}=\mathrm{P}} $
${\mathrm{I}=\sqrt{\frac{\mathrm{P}}{\mathrm{R}}}=20 \,\mathrm{m} \mathrm{A}}$
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