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R=120 volts/2 amps = 60 ohms<br />
P = (2 amps)(120 volts) = 240 watts<br />
P = (1.33 amps)(120 volts) = 160 watts<br />
I = 120 volts/90 ohms = 1.33 amps<br />
I = 23 watts/ 9 volts = 2.56 amps<br />
R= 9 volts/2.56 amps = 3.52 ohms<br />
I = 60 watts/ 120 volts = 0.5 amps<br />
R=120 volts/0.5 amps = 240 ohms<br />
(50 kWh)(0.07) = $3.50<br />
First find current… I =120 volts/9 ohms = 13.33 amps<br />
Then find power… P = (13.33 amps)(120 volts) = 1600 watts<br />
Convert power to kilowatts 1600 W = 1.6 kW and 10 minutes to 0.17 hours<br />
Finally… (1.6 kW)(0.17 hour)(0.07) = $0.02 or 2 cents
P= (0.5 amps)(110 volts) = 55 watts<br />
R= (0.6 amps)(110 volts) = 66 watts<br />
V= 5000 watts/20 amps = 250 volts<br />
I = 5600 watts/250 volts = 22.4 amps<br />
T = 0.6 kWh/0.4 kW = 1.5 hr<br />
E = (0.4 W)(2 h) = 0.8 kWh<br />
E = (1 kW)(8 hour) = 8 kWh<br />
(8 kWh)(0.07) = $0.56 or 56 cents<br />
E = (1 kW)(0.5 hour) = 0.5 kWh<br />
(0.5 kWh)(7 days)(0.07) = $0.25 or 25 cents
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