What is the light bulb’s current rating? 06/03/2020 – by Mod_GuideK 0 A 120 V light bulb is rated for 40 watts. What is the light bulb’s current rating? A. 3 A B. 1/3 A C. 2 A D. 1 A SHOW ANSWERSCorrect Answer: B Explanation/Reference: P = IV, so I = P/V or I = 40 Watts/120 V = 1/3 A Download Printable PDF. VALID exam to help you PASS.