A cell phone charger uses 4.83 joules per second when plugged into an outlet, but only 1.31 joules per
1 answer:
Well, that depends on how you look at it.
Efficiency =
<em>(amount of power that does what you want) / (total power supplied)</em>.
Power to charge battery . . . 1.31 watts
Power changed to heat . . . 3.52 watts
Total power supplied . . . . . . 4.83 watts
Using the cell-phone as a heater,
efficiency of the charger in supplying heat = 3.52 / 4.83 = <em>72.9 %</em> .
Using the cell-phone as cell-phone,
efficiency of the charger in charging the battery = 1.31 / 4.83 = <em>27.1 %</em> .
The charger is more efficient as a heater than it is as a battery charger.
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