Electric Battery Blanket
HELP! Calculate the current in an electric blanket W-140 connected to a 120-V.?
2) Calculate the resistance of the filament in a bulb when carrying 0.4 A 3.0 V is impressed across it. 3) How much current flows through the fingers (resistance: 1200 ohms) when you touch the terminals of the battery 6 volts?
I will explain the concepts and then try to do it yourself, it's very easy 
1. W is the unit power. Power is nothing but the current tense time. 140 = 120 x I find I 2. Resistance, current and potential are related by Ohm's law V Here V = IR = 3.0 V, I = 0.4A. R =? You can easily solve. 3. Use the same formula as 2 and you have it. Hope the concept is clear. Numarical part is really easy
Lec 14 | 8.01 Physics I: Classical Mechanics, Fall 1999
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