Unformatted text preview: does the refrigerator use each day? ( 4.58 KWH/day  .4 KWH/day = 4.18 KWH/day ) • Since ConEd charges me $.183 per KWH, how much does it cost me to run the refrigerator each day? $ .183/KWH * 4.18 KWH/day = $ .765/day (76 and a half cents a day). • What power is used by the refrigerator in watts ? The fridge is always on (24 hours a day) so Power = energy used/time = 4.18KWH/24 hr = .174 kW = 174 watts. • What current is used by the refrigerator? Use P = VI, we know P=174 watts, V=120 volts (household)so: I = P/V = 174W/120V = 1.45 A (amps). • What is the resistance of the refrigerator? Use Ohm’s Law: V=IR or R=V/I and we know V and I, so R=V/I=120V/1.45A = 82.7 Ω (ohms). 1...
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 Spring '08
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 Physics, Energy, 1 Hour, Joule, 24 hours, 24 hr, 1 kW

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