quiz lesson 6

# Lighting can reduce electricity consumption

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Unformatted text preview: ants to save energy and money. So, she has replaced the 100 Watt incandescent light bulb in her house with a 23 Watt CFL bulb. The expected life of incandescent and CFL bulbs is 800 h and 8000 hours respectively. The purchase price of an incandescent bulb is \$0.52 and for the CFL it is \$6.73. The cost of electricity is 10 cents per kWh. What is her total savings over the life of the CFL bulb? Correct D ) 60.07 CFL energy cost for 8000 hrs = 23 / 1000 x 8000 x 10/100 = \$18.4 Total cost for CFL = 6.73 + 18.4 = \$25.13 Incandescent light energy cost for 8000 hrs = 100/ 1000 x 8000 x 10/100 = \$80 # of Incandescent bulbs required = 8000/800 = 10 bulbs Total cost for Incandescent light = (0.52 x 10) + 80 = \$85.2 Total Savings = 85.2- 25.13 = \$60.07 What is the minimum amount of illumination that is required for reading? Correct D ) 50 fc A minimum of 50 fc of illumination is required for reading A spotlight is typically of what type? Correct C ) Type- R Typically, Type- R lamps are used for spotlight Compact fluorescent light usually has a ___________ compared to incandescent bulb producing the same amount of lumens. Correct A ) Longer life Compact fluorescent light usually has a longer life compared to incandescent bulb producing the same amount of lumens Tungsten- halogen lamps operate at very high temperatures (high enough to literally fry eggs) and should not be used in fixtures that have paper- or cellulose- lined sockets. Correct A ) TRUE Tungsten- halogen lamps operate at very high temperatures (high enough to literally fry eggs) and should not be used in fixtures that have paper- or cellulose- lined sockets Light bulb labels should contain what kind of information? Correct D ) all of the above Light bulb labels should contain light output, energy used and life of the bulb A foot- candle (fc) is defined as _____. Correct B ) a lumen of light distributed over 1 square foot area A foot- candle (fc) is defined as a lumen of light distributed over 1 square foot area Light bulb labels should contain what kind of information? Correct...
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