Unformatted text preview: takes to include each branch at least once. To write down a loop equation, you choose a starting point, and then walk around the loop in one direction until you get back to the starting point. As you cross batteries and resistors, write down each voltage change. Add these voltage gains and losses up and set them equal to zero. When you cross a battery from the  side to the + side, that's a positive change. Going the other way gives you a drop in potential, so that's a negative change. When you cross a resistor in the same direction as the current, that's also a drop in potential so it's a negative change in potential. Crossing a resistor in the opposite direction as the current gives you a positive change in potential....
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 Fall '10
 DavidJudd
 Physics, Addition, Current, Resistor, Equals sign

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