Chapter 17, Problem 36P

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

# If electrical energy costs $0.12 per kilowatt-hour, how much does it cost to (a) burn a 100-W lightbulb for 24 h? (b) Operate an electric oven for 5.0 h if it carries a current of 20.0 A at 220 V? (a) To determine The cost of electrical energy required to light. 100W bulb for 24hours Explanation Given Info: The cost of one kilowatt –hour of electrical energy is$0.12 power needed to operate bulb is 100W . Bulb is switched on for 24hours .

Explanation:

Formula to calculate the energy used by bulb is,

E=PΔt

• E is the energy used by bulb
• P is the power of bulb,
• Δt is the time period for which light is switched on

Substitute 100W for P and 24hours for Δt in the above equation to find E ,

E=(100W)(1

(b)

To determine
The cost of electrical energy required to operate an electric oven

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