An incandescent 100W light bulb costs $0.40 and lasts 1200 hours. A compact fluorescent light bulb which outputs the same amount of light uses only 23W, costs $3.65 and lasts 10,000 hours. Compare the cost of buying and using incandescent lights for 10,000 hours versus a compact fluorescent light bulb. Assume electricity costs $0.15 per kWhr. [1 kWhr is 1000W of power used for 1 hour. Power is energy/time so multiplying power times time give you energy.]

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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An incandescent 100W light bulb costs $0.40 and lasts 1200 hours. A compact fluorescent light bulb which outputs the same amount of light uses only 23W, costs $3.65 and lasts 10,000 hours. Compare the cost of buying and using incandescent lights for 10,000 hours versus a compact fluorescent light bulb. Assume electricity costs $0.15 per kWhr. [1 kWhr is 1000W of power used for 1 hour. Power is energy/time so multiplying power times time give you energy.]

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