Cell Phone Power Pack
What is the rms current?
A power pack charging a cell phone battery has an output of 0.40 A at 6.0 V (both rms).
What is the rms current at the 120 V / 60 Hz wall outlet where the power pack is plugged in?
if everything is 100% efficient, the output power = 0.4 x 6 = 2.4 watts. That means the input power has to be the same, 2.4 w = 120v x I
I = 2.4/120 = 0.02 amp.
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Energizer XP 18000 Universal Power Pack
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Solio Mono by Solio $59.95 115167 Features: The solar cell is both durable and powerful for quick charging Integrated, rechargeable and replaceable lithium-ion battery can be charged with the sun or plug it in to a USB outlet Stores power up to one year Works with most mobile phones, MP3 players, PDA’s and GPS’s right out of the box (additional adapters are available) Specifications: Size: 47 x 13 x 85 inches Internal batt… |
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