User:Sthuthi k nambiar/Sandbox

A SIMPLE GENERATOR

A simple generator may consists of a U-Shaped magnet and a single loop of wire.The area around the magnet where its force can be felt is called 'magnetic field'.To help describe a magnetic filed,we think of lines of force going out from the north pole of the magnet and returning into the magnet at its south pole.The stronger the magnet,the greater the n of lines of force.If we rotate the loop of the wire between the poles of the magnet,the two sides of the loop cut the lines of force.this induces the electric current in the loop.

In the first half of the turn,one side of the loop of wire cuts up through the lines of force.The other sides cuts down.This makes the current flow in one direction through the loop.Half way through the turn,the loop moves parallel through the lines of force.No lines of force are cut and no electric current is generated.In the second half of the turn,the side of the loop that was cutting upwards cut down through the lines of force.The other side of the loop cuts upward.This makes the electric current induced in the loop flow in a direction opposite to the half way of the turn.At the bottom of the turn, the loop again moves parallel to the line of force and no electric current is generated.

For every complete turn, the voltage and current generated travel in one direction,and in the Other half it travel n the opposite direction.Twice during each turn no current flows.The voltage and current are known as alternating voltage and alternating current.The voltage that generator produces can be increased by increasing the strength of the magnetic field,the speed at which the loop rotates or the number of loops of the wire that cuts the magnetic field.

One complete revolution of the loop through the lines of force is called a cycle.The number of such cycles in a second is called the frequency of the voltage or current and is measured in units called hertz.one hertz equals one cycle per second. There are different types of generators Ac-generators and DC-generators.