Your cell phone typically consumes about 300 mW of power when you text a friend.

Question

Your cell phone typically consumes about 300 mW of power when you text a friend. If the phone is operated using a lithium-ion battery with a voltage of 3.7 V, what is the current flowing through the cell-phone circuitry under these circumstances? A Compare your result with the data given in the table below. The current in the cell phone is less than a clock radio but greater than a spark plug. The current in the cell phone is less than a color television but greater than a 60-watt lightbulb. The current in the cell phone is less than a 60-watt lightbulb but greater than a clock radio. The current in the cell phone is less than a spark plug but greater than a calculator. The current in the cell phone is less than an 1800-watt hair dryer but greater than a color television.

Explanation / Answer

p = VI

I = 0.3/3.7 = 0.081 Amperes

The current in the cell phone is less than a 60-watt lightbulb but greater than a clock radio

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