Measuring Current, Voltage, and Resistance

Ohm's law describes the relationship between current, voltage, and resistance in many materials. In these cases, the current through a substance is directly proportional to the voltage applied to it. The idea was first shown experimentally by German physicist Georg Simon Ohm, who studied current in a metal wire.

In 1827, a German physicist, Georg Simon Ohm, demonstrated Ohm's law experimentally.

Ohm's law states that the current passing through a material is directly proportional to the voltage across the device under constant surrounding conditions.

Any material that obeys Ohm's law is known as an ohmic material, whereas if it does not ob...