Physics

Question

A heater with an effective resistance of 4.8 ohms is connected to 240.0 volts if it operated approximately 25% of the time and electricity costs $0.10 per kWh what will be the electrical bill for30 days

1 Answer


  • -- Power used when the heater is running =

                             V²/R = (240)²/4.8= 12,000 watts. (12 KW)

    (A gigantic heater ... suitable for maybe a theater, not for a home.)

    -- Energy consumed in one day:

                     (12 KW) x (24 hours) x (25%) = 72 KwH per day

    -- Energy consumed in 30 days:  (72 KwH/day) x (30 days) =

                      2,160 KwH in 30 days

    -- Cost = ($0.1 / KwH) x (2,160 KwH) = $216.00  in 30 days


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