A dishwasher uses about 1400 watts of power. If the power company charges 9 cents per kilowatt-hour, how much does it cost to run a dishwasher for 16 hours?

Question

A dishwasher uses about 1400 watts of power. If the power company charges 9 cents per kilowatt-hour, how much does it cost to run a dishwasher for 16 hours?

 

How do I set this up to solve?

Answer 1

First, let's notice that 1400 W = 1.4 kW. Therefore, the energy consumption as per the problem definition would be 1.4x16 = 22.4 kwH and corresponding charges would be: 22.4 x 0.09 = $2.016, or omitting the fractions of cents: $2.01