There are 3 quantities that every beginners will face when starting to learn about electronics. They are potential difference, resistance and current. The first one is refered to voltage and the unit of measurement is volts. Unit of resistance is ohms. The current is measured and displayed by amps.

The relation between these three items are expressed as V= R * I

Or Voltage equals Resistance times Current. 

For example if you pull out one of your electric stove element and measure its resistance to be say 48 Ohms, you can calculate that when full 240 Vac applied to it will cause a current of 5 Amps to be drawn:

240=48 * 5

More explanation at the main page at

Jay Kajavi
July 6, 2011