Question

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 :

• A. 63 mA
• B. 0.4 mA
• C. 100 mA
• D. 20 mA

Answer 1

Answer: (D)

20 mA

Answer 2

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