In doing an energy audit of a home you find that both the front and the back porches of the home have overhead light fixtures set on timers. Each porch's light fixture contains two 40 W incandescent bulbs, and the timers turn the porch lights on for 8 hours every day. If the homeowner replaced the 40 W bulbs with equivalent 4.5 W LED bulbs, how much would the annual energy consumption be reduced in kWh?
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207.32 kWh is the annual energy consumption be reduced in kWh
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Step-by-step explanation:
Each porch's light fixture contains two 40 W incandescent bulbs
Consumption Per hour = 40 + 40 = 80Wh
timers turn the porch lights on for 8 hours every day
=> Consumption every Day = 8 * 80 = 640 Wh
365 days in a year
=> Consumption every year = 365 * 640 = 233600 Wh
= 233.6 kWh
replaced the 40 W bulbs with equivalent 4.5 W LED bulbs,
Consumption Per hour = 4.5 + 4.5 = 9Wh
timers turn the porch lights on for 8 hours every day
=> Consumption every Day = 8 * 9 = 72 Wh
365 days in a year
=> Consumption every year = 365 * 72 = 26280 Wh
= 26.28 kWh
annual energy consumption be reduced in kWh = 233.6 - 26.28
= 207.32 kWh