Power in Circuits Video Lessons

Concept

# Problem: a) A 60 W light bulb is plugged into a standard 120 V outlet. How much does it cost per 30-day month to leave the light turned on continuously? Assume electrical energy costs $0.12/kW-hr. b) What is the current through the bulb? c) What is the resistance of the bulb? ###### FREE Expert Solution (a) E = P•t P = 60 W (1kW/1000W) = 0.06 kW t = 30 day(24 hr/1day) = 720 hr E = 0.06 × 720 = 43.2 kW-hr ###### Problem Details a) A 60 W light bulb is plugged into a standard 120 V outlet. How much does it cost per 30-day month to leave the light turned on continuously? Assume electrical energy costs$0.12/kW-hr.

b) What is the current through the bulb?

c) What is the resistance of the bulb?