Question

An incandescent lamp with a resistance of 40 Ω draws a current of 5.0 A. Find the line voltage.

Answer 1

I = 5.0 A; R = 40 Ω; V = ?

By Ohm's law, I = $$\frac{V}{R}$$

$$\therefore V = I.R$$

$$ = 5.0 \times 40$$

$$= 200 \text{ volts}$$