1. The problem statement, all variables and given/known data What exactly happens to the voltage... in between things such as resistors, and bulbs? It isn't a homework question it is just something that is bothering me. 2. Relevant equations V=IR for resistors Sum of V in a closed loop is zero. 3. The attempt at a solution If there was a circuit that had nothing but a battery, would the potential difference everywhere be equal to the V of the battery? If there was a battery, and a resistor in a circuit. Then we know that V-IR=0. And we know that V=IR. So the voltage of the battery and the resistor are equal. Well what is the voltage in the wire between the the battery and the resistor?