Use the values in the table below Average power consumption of common electrical

Question

Use the values in the table below Average power consumption of common electrical devices Electrical device Mobile phone charger Part A Suppose you use your microwave oven for 38 minutes each day. The remaining time the oven is ready with the door closed. Calculate the total number of kilowatt-hours used by the microwave oven in one month. Assume 30 days in a month. Power [W] Express your answer using three significant figures Attached to phone, phone charging 3.68 Plugged into wall outlet but not into phone 0.26 Notebook computer AC adapter Attached to computer, computer charging Attached to computer, computer sleeping Attached to computer, computer off Plugged into wall outlet but not into computer 44.28 15.77 8.9 4.42 P- 1022.67 kWh Submit Previous Answers Request Answer DVD player On and playing On and not playing Off 9.91 7.54 1.55 X Incorrect; Try Again; 2 attempts remaining Microwave overn Part B Ready with door closed Ready with door open Cooking 3.08 25.79 1433.0 What percentage of the power used by the microwave oven in one month is consumed when the oven is ready with the door closed? Inkjet multifunction printer Express your answer using three significant figures On 9.16 Off 5.26 vec percentage Submit ous Answers Request Answer Incorrect Try Again; 3 attempts remaining

Explanation / Answer

Part: A)

Power Consumption In cooking mode per day

= (1433 × 38) W-min

=(54454) W-min

=54454/(60×1000) kW-h

=0.9076 kW-h

Power Consumption in ready with door closed mode per day

=3.08×{(24×60)-38} W-min

=3.08×1402

=4318.16 W-min

=4318.16/(60×1000) kW-h

=0.07197 kW-h

So, overall power consumed by the microwave in a day

= (0.9076+0.07197) kW-h

=0.97957 kW-h

So monthly consumption

=0.97957×30

=29.3871 kW-h

Answer: 29.387kW-h

Part B)

Per day total power consumption= 0.97957 kW-h

Per day power consumption in ready with door closed mode

=0.07197 kW-h

So the percentage of the power consumed in door closed mode

=(0.07197/0.97957)×100

=7.3471%

Answer: 7.347%

#NOTE: Monthly percentage is equal to the daily percentage as the use of the microwave is uniform through out the month.

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