Homework Help

A microwave draws 5.0A when it is connected to a 120V outlet. If electrical energy cost...

user profile pic

conversehottie | Student, Grade 9 | eNotes Newbie

Posted February 5, 2009 at 2:21 PM via web

dislike 1 like

A microwave draws 5.0A when it is connected to a 120V outlet. If electrical energy cost $0.090/kwh, what is the cost of running the mircrowave for 6hr

2 Answers | Add Yours

user profile pic

william1941 | College Teacher | Valedictorian

Posted October 4, 2010 at 11:32 PM (Answer #1)

dislike 1 like

The energy utilized is given by the product of power and time. Power is given by the product of voltage and current. Here the microwave draws a voltage of 5 A from a 120 V outlet. The power drawn is voltage * current

=> 5* 120

=> 600 Watt or 0.6 kW

When the oven is run for 6 hr, it uses 0.6 * 6 = 3.6 Kilowatt hour. Each kWh costs $ 0.09 or 9 cents.

Therefore the cost of energy is 0.09* 3.6 = $ 0.324 or 32.4 cents.

user profile pic

stevenjohnson | Student, Grade 9 | eNotes Newbie

Posted February 8, 2009 at 10:28 AM (Answer #2)

dislike 0 like

it will cost an estimated 6 dollars and 66 cents

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes