The law is named after early 19th century German physicist, George S Ohm.

Ohm found that the current in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance in the circuit. Ohm's Law therefore sets out some of the most fundamental rules of how electricity behaves. To properly understand electricity and its characteristics it is important to understand the relationship between volts, amps and ohms.

Studying Ohm's Law reveals that it can be broken down into three straight-forward statements that always hold true. Understanding Ohm's Law enables you to comprehend what any voltage, resistance or amperage indicates about the other two values in a similar fashion to distance, speed and time, which will be familiar to all school children.

The three truths in Ohm's Law are:

* if resistance remains the same, the current flow goes up or down if voltage goes up or down

* when resistance goes up, the current goes down so long as the voltage remains the same

* and when resistance goes down, current goes up if the voltage is still the same.