An indicator light on a control panel operates continuously, drawing 20 mA from a
120-V supply. At $0.09 per kilowatt-hour, how much does it cost per year to operate the light?
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Given : An indicator light on a control panel operates continuously, drawing 20 mA from a 120-V supply. At $0.09 per kilowatt-hour,
To Find : how much does it cost per year to operate the light
Solution:
1 year = 365 * 24 hrs
P = VI
120 V *20 mA
= 120 * 20 /1000
= 2400/1000
= 2.4 W
365 * 24 * 2.4 Whr
= 21,024 W hr
= 21.024 KWhr
$0.09 per kilowatt-hour
= 0.09 * 21.024
= 1.89216 $
it cost 1.89216 $ per year to operate the light
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