# Category: Physics

## Electric generators

An electric generator is essentially the opposite of a motor. A motor turns Electrical Potential Energy to Mechanical Energy. A generator turns ME to EPE Average EMF induced in a coil Is the same...

When the magnetic flux through a coil changes with time, an EMF is generated within the coil. This EMF creates a current, which in turn produces a magnetic flux which opposes the changes to...

## Eddy currents

Are electric currents induced within conductors by a changing magnetic field The greater the electrical conductivity, the stronger the current.   The circulating current then produces its own magnetic field which opposes the changes...

## Magnetic induction

Any change in the magnetic flux passing through a loop of wire will cause an EMF to be induced in the loop The EMF produces a current The current in the loop has its...

## Magnetic Flux

Flux is the rate of flow of particles through a given surface. Magnetic flux (Φ) is measure in Webers. Φ = BA Where: B = magnetic flux density A = Area through which the...

## Electric motors

Electric motors use force produced by current carrying conductors to create torque Instead of single conductors, they use wires wound into coils Permanent magnet DC motors Current flows from power supply into the stationary...

## Magnetic force

If a charge is moving through a magnetic field, the force on the charge is given by: F = qvB q = charge (C) v = velocity of the charge moving through the field...

## Current carrying conductors

When current flows through a conductor, charge moves from one end to the other The movement of charge produces a magnetic field Right-hand grip rule Determine the direction of conventional current Point your right...

## the Earth’s Magnetism

Earth acts as a giant bar magnet The magnetic north and south poles are situated near but not at the same point as the geographic poles Angle of declination The Earth’s geographic poles correspond...

## Magnetism Basics

All magnetism is caused by moving charges In permanent magnets, the spinning of electrons create magnetism In electromagnets, magnetic fields result from electron flow through a conductor A magnet is any object that produces...