Question

The power rating of a clock is 10 W, and the cost of electrical energy is $0.15 per kilowatt-hour. Rounded to the nearest cent, how much does it cost to run the clock for one whole week?

Answer 1

Well, don't you just need to multiply 10w times 0.15 

Answer 2

Answer:

$0.252

Explanation:

The power rating of an appliance suggests the amount of energy consumed per unit time.

The power rating of clock is given as 10 W.

It runs for 1 week. 1 week = 7 days = 7 ×24 hours = 168 hours

Consumption of electrical energy in one week would be = 1680 Watt-hour = 1.68 kW-hr

It is given that the cost of electrical energy is $0.15 per kW-hr

Thus, the total cost to run the clock would be:

$0.15 per kW-hr × 1.68 kW-hr = $0.252