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Magnetism

A series of free High School Physics Video Lessons from Brightstorm online Physics series.

Ampere's Law
Ampere's Law was discovered in 1819 by Ampere. Ampere's Law states that currents generate magnetic fields or in other words, whenever you have a current, there is a magnetic field circulate around it. Ampere's Law is expressed in the equation magnetic field x 2(pi) x radius = constant x current(passing through that path).

Solenoids - Electromagnets
Solenoids is a configuration of wires wrapped in a mass of loops that creates a magnetic field in a given direction which is used as the basis for electromagnets, or temporary electricity driven magnets.

Faraday-Lenz Law
The Faraday - Lenz law states that when you have change in magnetic flux, you generate electromotive force. The formula to determine the Faraday - Lenz law is magnetic flux = magnetic field x area.

Electromagnetic Induction
Electromagnetic induction is the concept of changing in one current induces changes in another current. This results in the production of voltage through magnetic field described in Ampere's Law. The right hand rule is applied to the induced current. The concept of electromagnetic has led to power transmission.

Transformers - Power Transmission
Transformers are used to change a current into another current. Step up transformer increases the voltage and step down transformer decreases the voltage. In power transmission, which is power transmitted through wires over large distances, there is a power loss due to the resistance caused by ( I^2)R heating, step up transformer is needed to pump up the voltage using AC.

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