A 106 V potential difference is applied to a space heater whose resistance is 11 when hot.?
A 106 V potential difference is applied to a space heater whose resistance is 11 when hot.
What is the cost of operating the device for 9.0 h at US$0.05/kW·h?
Can anyone help?
You need to calculate the energy used in kWh
Use E = Power*time
Power = V^2/R = 106^2/11 = 1021W = 1.021kW
the time is 9 hr So E = 1.021*9 = 9.19 kWh
So the cost = 9.19kWh*$0.05/kWh = $0.46 46 cents
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