Current, Voltage and Resistance
Current, voltage and resistance are three important concepts in electronics. In a circuit, current is the flow of electrons. Voltage is the electrical potential difference between two points. Resistance is something that resists the flow of electrons.
If this sounds complicated to you, don’t worry. Think about it this way: If you have water running in a pipe, the amount of water running is the equivalent of the current in an electrical circuit. Then imagine that the pipe is clogged at some point. And only a little bit of water gets through. The water pressure on one side of the clog will be higher than on the other side. This difference in pressure between the two points is the equivalent to voltage. You always measure voltage as a voltage difference between two points. The clog itself would be the resistance.
Current is measured in Amp or A, voltage is measured in Volt or V, and resistance is measured in Ohm or Ω. The relationship between current, voltage and resistance is called Ohm’s Law.