Your cell phone typically consumes about 330 mW of power when you text a friend.

Question

Your cell phone typically consumes about 330 mW of power when you text a friend. If the phone is operated using a lithium-ion battery with a voltage of 3.5 V, what is the current flowing through the cell-phone circuitry under these circumstances in A?

Compare your result with the data given in the table below.

Choose one answer below:

*The current in the cell phone is less than an 1800-watt hair dryer but greater than a color television.

*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 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 clock radio but greater than a spark plug.

Explanation / Answer

Given,

Power = 330 mW = 330 x 10-3 W ; Voltage = V = 3.5 V

We need to find the current I.

We know that electrical power is related to voltage and current as:

P = VI => I = P/V

I = 330 x 10-3 W / 3.5 = 94.3 x 10-3 A

Hence, I = 94.3 x 10-3 A = 0.0943 A (0.09 aprox)

On comparing we find that,

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

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