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) $5.50.
B) $2.20.
C) $0.55.
D) $0.22.
E) none of these

Question

Quizplus · Accepted Answer

The power consumed by the heater can be calculated using the formula P = IV, where I is the current (20 A) and V is the voltage (110 V). So, P = 20 A * 110 V = 2200 W or 2.2 kW. The cost of running the heater for 10 hours is then 2.2 kW * 10 hours * $0.10/kWh = $2.20.

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