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PhysicsThrow
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Homework Statement
Calculate the power drawn from the batteries by the amplifier. The batteries are +9v and -9v.
The amplifier draws a current of 8mA from each of its power supplies.
Homework Equations
P = VI
The Attempt at a Solution
I'm just a little stumped as to what to do for the current. I know V = 18v but I'm not sure how the 2 currents interact with each other. Do they cancel out? Do they multiply or sum up?
I'm sure I can finish the rest if I understand that.