header bg

Scan QR code or get instant email to install app

Question:

A 120 V light bulb is rated for 40 watts. What is the light bulb's current rating?

A 1/3 A
explanation

P = IV, so I = P/V or \(I = \frac{\mathrm{40watts} }{\mathrm{120V} } = \frac{\mathrm{1} }{\mathrm{3}}A\)