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  4. 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 :

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Q. 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 :

JEE MainJEE Main 2019Current Electricity

Solution:

$P = i^2R$.
$\therefore $ for $i_{max}$, R must be minimum from color coding $R = 50 \times 10^2 \Omega$
$\therefore \; i_{max} = 20\,mA$