A 500-W heater carries a current of 4.0 A.How much does it cost to operate the heater for 30 min if electrical energy costs 6.0 cents per kWh?
A)1.5 cents
B)9 cents
C)6.0 cents
D)0.042 cents
E)30 cents

Question

Quizplus · Accepted Answer

The power of the heater is given as 500 W (or 0.5 kW), and it operates for 30 minutes (or 0.5 hours). The cost of electrical energy is 6.0 cents per kWh. To find the cost of operating the heater, multiply the power by the time and then by the cost per kWh: $0.5 \text{ kW} \times 0.5 \text{ hours} \times 6.0 \text{ cents/kWh} = 1.5 \text{ cents}$.

A 500-W Heater Carries a Current of 4