# ELECTROMAGNETIC INDUCTION

## George Simon Ohm

As a high school teacher he began his research with the new electrochemical cell. Ohm found that there is a direct proportionality between the potential difference applied across a conductor and the resultant electric current. This relationship is known as ohms law.

Ohm's Law defines the interplay between electrical power, voltage, current and resistance.

Ohm examines the decrease in the electromagnetic force produced by a wire as the length of the wire increased.

## Electromagnetic induction

The finding that electric currents can produce magnetic fields led to the idea that magnetic fields could produce electric currents. The production of electric magnetic currents by the changing magnetic field through a conducting loop is called induction.

One of the most widely is in electrical generators where mechanical power is used to move a mechanical field past coils of wire to generate voltage.

A electric motor is a device for transforming electrical energy into mechanical energy; an electric generator does the reverse, using mechanical energy to generate electricity. At the heart of both motors and generators is a wire coil in a magnetic field. In fact, the same device can be used a motor or a generator.

When the device is used as a motor, a current is passed through the coil. The interaction of the magnetic field with the current causes the coil to spin. To use the device as a generator, the coil can be spun, including a current in the coil.