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A water heater heats 151 gal of water from 54oF to 137oF every day. What is the annual energy requirement of the water heater
Annual energy requirement = 151 (137 - 54) 8.3 * 365 = 37968723.5 BTUs. Note: 1 gal of water weighs 8.3 lbs.
An old refrigerator consumes 250 W of power. Assuming that the refrigerator operates for 18 hours everyday, what is the annual operating cost of the refrigerator, if the cost of electricity is $0.06 per kWh?
Annual operating cost = 250 / 1000 18 0.06 * 365 = $98.55.
Which one of the following is true about global temperatures in the last century
iincreased about 1 degree fahrenheit
global climate change caused by
increase in concentration of greenhouse gases in atmosphere due to human activities
PM2.5 describes the "fine" particles that are _____ 2.5 µm (micro meter) in diameter
PM2.5 describes the "fine" particles that are smaller than or equal to 2.5 µm (micro meter) in diameter.
kitchen - 5 by 10
50 footcandles of illumination
how many 40 watt bulbs if one emits 500 lumens
5*10 = 50
lumens required: 50*50= 2500
2500/ 500 = 5 bulbs
120-watt light bulb left on for 24 hours
how much to operate light bulb if electricity costs 6 cents per Kwh
E consumed = 120/1000*24 = 2.88
E cost = 2.88 * 6/100 = $0.1728
incandescent light bulb is operated for 12 hours
15 watt fluorescent light
10 cents per kWh, cost savings
1.2*10/100 = 0.12
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