An electric heater uses 12 amperes at 110 volts. If the cost of electricity is 13 cents per kWh, how much does it cost to operate the heater for 30.0 minutes a day for a month?
2006-11-04 08:36:24 · 3 answers · asked by Kameliya 2 in Science & Mathematics ➔ Physics
power = V x I
= 110 V x 12 A
=1320 watts
or 1.32 kw
cost = Power x time x rate
= (1.32kw) x (0.5 hours x 31 days) x 0.13/kwh
= $2.66
the answer below me is also correct, just depending on how many days you consider to be a month
2006-11-04 08:55:50 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Power = current x voltage
= 1320W
= 1.32 kW
Assuming 30 days a month
30 x 0.5 = 15 hours a month
1.32 x 15 = 1.98 kWh
Cost = 13 x 1.98
= 257.40 cents
= $2.57
2006-11-04 08:56:28 · answer #2 · answered by luv_phy 3 · 0⤊ 0⤋
wait until the bill comes in they will tell you and how
2006-11-04 08:40:37 · answer #3 · answered by srracvuee 7 · 0⤊ 0⤋