Question

lee watches tv for 2 hours per day. during that time, the tv consumes 250 watts per hour. electricity costs (18 cents)/(1 kilowatt-hour). how much does lee’s tv cost to operate for a month of 30 days?

Explanation:

Step1: Convert watts to kilowatts

The TV consumes 250 watts. Since 1 kilowatt = 1000 watts, we convert 250 watts to kilowatts by dividing by 1000: $250 \div 1000 = 0.25$ kilowatts.

Step2: Calculate daily energy consumption

Lee watches TV for 2 hours per day. Energy consumption (in kilowatt - hours) is calculated by multiplying power (in kilowatts) by time (in hours). So daily energy consumption is $0.25\times2 = 0.5$ kilowatt - hours.

Step3: Calculate monthly energy consumption

There are 30 days in a month. So monthly energy consumption is $0.5\times30 = 15$ kilowatt - hours.

Step4: Calculate monthly cost

Electricity costs 18 cents per kilowatt - hour. So the monthly cost is $15\times18 = 270$ cents.

Answer:

270 cents