Question

A $2W$ carbon resistor is color coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is

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

Answer 1

The correct option is D $20mA$

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