Question

An electric device operates at 24 V and has a resistance of 8 Ω. Calculate the power of the device and the current flowing through it.

Answer 1

V = 24 V; R = 8 Ω; P = ?; I = ?

(i) \[\text{P} = \frac{\text{V}^{2}}{\text{R}}\]

\[= \frac{24 \times 24}{8}\]

= 72 W

(ii) \[\text{R} = \frac{\text{V}}{\text{I}}\]

\[\therefore \text{I} = \frac{\text{V}}{\text{R}}\]

\[= \frac{24}{8}\]

= 3 A