A heater uses 20 A when used in a 110-V line.If electric power costs 10 cents per kilowatt hour,the cost of running the heater for 10 hours is
A)$0.22.
B)$0.55.
C)$2.20.
D)$5.50.
E)none of these

Question

Quizplus · Accepted Answer

The power used by the heater can be calculated using the formula:

Power = Voltage x Current

Therefore, the power used by the heater is:

P = 110 V x 20 A = 2200 W

The energy used by the heater in 10 hours can be calculated as:

Energy = Power x Time

= 2200 W x 10 hours

= 22000 Wh or 22 kWh

The cost of running the heater for 10 hours can be calculated as:

Cost = Energy x Cost per kWh

= 22 kWh x 10 cents/kWh

= $2.20

Therefore, the correct answer is (C) $2.20.

A Heater Uses 20 a When Used in a 110-V