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Your friend is heating some food in the microwave. The two lights in the kitchen are...

Your friend is heating some food in the microwave. The two lights in the kitchen are off. You join your friend in the kitchen and turn the lights on as you enter. Your friend says “Since you turned the lights on I’ll have to leave the pizza in the microwave longer.” You’re not so sure about this, but your friend tries to explain. They take out a piece of paper and draws the circuit shown. “When you turned on the lights you closed the switch in the circuit. This means the current from the power supply is being split between the microwave and the two lights. Since the power output of a device is ? = ?∆? and the current through the microwave is now lower, the power output of the microwave will be lower and the pizza will take longer to cook.”

Parallel circuit

Delta V= 120 V

Microwave R= 9.6 Ohm

Both Light R= 192 Ohm

a) You’re pretty sure you’ve never noticed having to heat something longer in the microwave if the lights were on. Explain the problem with your friend’s reasoning.

b) Assuming your friend’s circuit is a reasonable representation of the wiring in the kitchen, determine the power output of the power supply when just the microwave is on. Then, determine the power output of the power supply when the microwave and two lights are on.

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