Question

An electric drill at 400 W is connected to 120 V power line. What is the resistance of the drill?

Answer 1

Answer:

36 ohm

Explanation:

Given :

P=400 W

V=120V

Now,

$P=\frac{V^{2} }{R} \\400=\frac{120^{2} }{R} \\400R=14400\\R=\frac{14400}{400} \\R=36 ohm$

Therefore, resistance of the drill will be 36 ohm