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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

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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?

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