Wikipedia defines the volt as "The volt is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power." Doesn't resistance always determine the dissipation of power? If you were to have a superconductor with no resistance then the current would flow but no energy would be dissipated. Does that mean theres no voltage even one terminal is charged differently to the other? I don't understand how dissipation of energy comes into the definition of the volt seeing as the dissipation of energy would vary depending on the resistance of the conductor while the potential difference between the two points would remain the same. If I had a circuit with a 7 volt battery. The resistance of the circuit is 1 ohm. There is a current of 7 amps flowing throughout the circuit which is dissipating 7 watts. Lets say I raise the resistance of the circuit to 2 ohms so there is a current of 3.5 amps flowing. Would this circuit still dissipate 7 amps due to the increased resistance? Anyhow in this case I changed the amount of amps but the voltage remained the same. If a volt is defined as the potential difference when 1 amp dissipates 1 watt how can the voltage remain the same when I alter the current due to resistance?