The simplest complete circuit is a piece of wire from one end of a battery to the other. An electric current can flow in the wire from one end of the battery to the other, but nothing useful happens.

The Potential Difference or Voltage Drop can be considered the voltage difference between any two points in a circuit. It is also the difference in electric potential between the final and the initial ...

Higher Physics - current, potential difference, power and resistance. revision-guideHigher Physics - current, potential difference, power and resistance Brush up on your current, potential difference, ...