Question

Resistance of a electric heater is $20\Omega$ and it draws a current of 2A. Calculate its power.

• A. 0 (zero) w
• B. 20w
• C. 40w
• D. 80w

Answer 1

The correct option is D 80w

Given : $I=2$ A $R=20\Omega$

$\therefore$ Power of heater $P=I^{2}R=2^2\times 20=80$ W