How does the sum of all the voltage drops in a circuit equal zero? Lets say I have a 5V power source. 5V on the negative terminal 0V on the positive terminal. I have 2 resistors both of which cause the voltage to drop 2V. At the end I have 1V flowing between the second resistor and the positive terminal. If I add those 2 voltage drops together I get 4V not 0V. Am I getting this mixed up?