Question

An electric lamp rated at 48 watts,12volts supply. Calculate the current flow in the lamp and the resistance.

Answer 1

Let's use the formula of power.

`P=I\cdot V`

Where P = 48 watts and V is 12 volts, let's use these magnitudes and solve for I.

`48W=I\cdot12V`

Divide both sides by 12V.

`\begin{gathered} (48W)/(12V)=(I)/(12V)\cdot12V \\ I=4A \end{gathered}`

Therefore, the current flow in the lamp is 4 A.