Question
Your cell phone typically consumes about
of power when you text a friend. If the phone is operated using a lithium-ion battery with a voltage of
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.
Your cell phone typically consumes about 360 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? 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 60-watt light bulb 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 a color television but greater than a 60-watt lightbulb. The current in the cell phone is less than an 1800-watt hair dryer but greater than a color television.
Explanation / Answer
I = Power / V = 0.360 / 3.5 = 0.10285 amp
The current in the cell phone is less than a 60-watt lightbulb but greater than a clock radio.