If a kilowatt-hour costs .055 dollars, how long could $10.00worth of electricity

Question

If a kilowatt-hour costs .055 dollars, how long could $10.00worth of electricity operate an 1850 W toaster? A hot plate has an internal resistance of 22 ohms. Itoperates on 120 V AC electricity If it operated for 15 minutes how much head did it develop? If a kilowatt-hour costs .055 dollars, how long could $10.00worth of electricity operate an 1850 W toaster? A hot plate has an internal resistance of 22 ohms. Itoperates on 120 V AC electricity If it operated for 15 minutes how much head did it develop?

Explanation / Answer

Cost 1 kilowatt-hour = $ 0.055 No.of kilowatt-hours in $10 is N = $10 / $0.055                                                    = 181.818 kilowatt-hour Power of toaster P = 1850 W                              = 1.850 kW time t = 181.818 kilowatt-hour / 1.850 kW           = 98.28hours         

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