What will be the approximate cost of running a 2 watt clock for one week when electricity
Costs 8¢ per kWh?
A) 0.1¢
B) 3¢
C) 11¢
D) 16¢
E) 115¢

Question

Quizplus · Accepted Answer

First, we need to calculate the energy consumed by the clock in one hour using the formula:

Energy = Power x Time

Energy = 2 watts x 1 hour = 2 watt-hours

Next, we need to convert watt-hours to kilowatt-hours (kWh) since the electricity cost is given in kWh.

1 kWh = 1000 watt-hours

Therefore, 2 watt-hours = 0.002 kWh

Finally, we can calculate the cost of running the clock for one week (7 days) using the formula:

Cost = Energy x Rate x Time

Cost = 0.002 kWh x 8¢/kWh x 7 days x 24 hours/day

Cost = 2.688¢ or approximately 3¢ (rounded to the nearest penny)

Therefore, the best choice is B.

What Will Be the Approximate Cost of Running a 2