2009Chp32Soln

# 2009Chp32Soln - 32.53.Solve:The cost of energy of a 60 W...

This preview shows pages 1–2. Sign up to view the full content.

32.53. Solve: The cost of energy of a 60 W incandescent bulb over its lifetime is 1 kW \$0.10 60 W 1000 h \$6.00 1000 W 1 kWh × × × = This means the life-cycle cost of the incandescent bulb is \$6.50. The cost of energy of a 15 W compact fluorescent bulb over its lifetime is 1 kW \$0.10 15 W 10,000 h \$15.00 1000 W 1 kWh × × × = With the bulb’s cost of \$15, the life-cycle cost is \$30.00. To make a comparison of the cost effectiveness of the two bulbs, we note that you need ten incandescent bulbs to last as long as one fluorescent bulb. Thus, it will cost a consumer \$65.00 to use incandescent bulbs for the same time span as a single fluorescent bulb that will cost only \$30.00. The fluorescent bulb is cheaper. 32.68. Model: The wires are ideal, but the batteries are not. Visualize: Solve: (a) The good battery alone can drive a current through the starter motor ( 29 12 V 200 A 0.01 0.05 I = = Ω + (b) Alone, the dead battery drives a current ( 29 8.0 V 14.5 A 0.50 0.05 I = = Ω +

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 04/03/2012 for the course PHYSICS AN 101 taught by Professor N.a during the Spring '12 term at Clark College.

### Page1 / 2

2009Chp32Soln - 32.53.Solve:The cost of energy of a 60 W...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online