# Modern Electromagnetism

## Georg Ohm

1. The focus of Ohm’s research was to study the conductivity of metals, and the behavior of electrical circuits.

2. Ohm discovered what is now known as the Ohm’s Law, which describes that “ If the temperature is constant, the current flow through the conductor is directly proportional to the potential difference and inversely proportional to the resistance.” He discovered this law mathematically, and published the law in his famous book called Die galvanische Kette, mathematisch bearbeitet (1827).

3. Ohm's later discovery was his acoustic law, which states that a musical sound is perceived by the ear as a set of a number of constituent pure harmonic tones. It is well known to be not quite true.

4. Ohm’s discoveries help us better understand electricity and conductivity, and help us with modern uses such as how to install electrical units in houses, and buildings.

## How Electromagnetism Improves Our Lives

1) Electromagnetics controls, switches in relays, which help people use telephones and computers.

2) They are used in security systems for doors and windows in our homes and buildings.

3) Electromagnets are also found useful to NASA engineers that help create space crafts, which help us get to space.

4) Electromagnets are also used in transportation like airplanes, to help them fly, and also trains, that levitate the cars.

5) Electromagnets are even found in your back pocket. The strip on the back of a credit card contains magnet particles, that contain account information, thus making it easier to transfer that information.

## Motors And Generators

The basic principals of how motors run is A simple motor has a coil of wire that can rotate in a magnetic field. The current in the coil is supplied by two brushes that make moving contact with a split ring. The coil lies in a steady magnetic field. The forces exerted on the current-carrying wires create a tourque on the coil.
THe electricity used in an object with a genorator and/or motor is definitely inportant in generating its power. But in fact, it’s not the electricity itself powering the motor, but the charge created by the magnet. The force of the magnet creates a rotation around a fixed point.
AC unites are one of the best inventions of our time, and its genoratos cunduct a current, that can cool, or heat large buildings such as office buildings, and schools.
A generator is basically an electric motor working in reverse. Both are based on principles of magnetism. several objects that use electromagnetism, ussually have high voltage, and a mass amount of electricity flowing through currents. For example, televisions use extremely high voltage electromagnets to power their cathode rays.

By now we have learned that through electromagnetism, an electric motor is a device for transforming electrical energy into mechanical energy, and that an electric generator does the reverse, using mechanical energy to generate electricity. to further explain this process,

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, inducing a current in the coil. The interior of the object on the left, is a perfect example of a motor.

## Special Thanks To...

Mr. Michael Faraday, and Mr. William Russell