A heater draws 20A when connected to a 110-V line. If the electric power costs 20 cents per kilowatt hour, the cost of running the heater for 10 hours is
A)$0.44.
B)$1.10.
C)$4.40.
D)$11.00.
E)none of the above

Question

Quizplus · Accepted Answer

First, calculate the power of the heater:

power = voltage x current = 110 V x 20 A = 2200 W

Then, calculate the energy used by the heater in 10 hours:

energy = power x time = 2200 W x 10 h = 22000 Wh = 22 kWh

Finally, calculate the cost of the energy used:

cost = energy x cost per kWh = 22 kWh x $0.20/kWh = $4.40

Therefore, the cost of running the heater for 10 hours is $4.40.

A Heater Draws 20A When Connected to a 110-V Line