Tag: magnetism and electromagnetism

Dynamo is a type of electrical generator and produces dc current as output.

A dynamo consists of 
1) A horse-shoe magnet 
2) An armature coil 
3) Two slip rings
4) Two carbon brushes
5) The external circuit (or load)

A dynamo consists of 
1) A horse-shoe magnet 
2) An armature coil  
3) Two slip rings
4) Two carbon brushes
5) The external circuit (or load)

A dynamo is a device which converts mechanical energy into electrical energy. 

Dynamo consists of horse-shoe magnet, armature coil, two slip rings, two carbon brushes, external circuit/load

Dynamo produces DC as output while transformer can be used to step-up or step-down AC voltage only.

Output emf is induced in armature coil which delivers power to the load.

Induced voltage in the rotating loop is given by   $\mathcal{E} = NBAw \ \sin wt$
where $N$ is the number of turns in the loop, $A$ is the area of the loop, $B$ is the magnetic field and $w$ is the angular speed of rotation of loop.
$\implies \ \mathcal{E}\propto w$
So, the induced voltage increases on increasing the speed of rotation of loop.

The AC dynamo (generator) is made up of stationary magnets (stator) which create a powerful magnetic field, and a rotating magnet (rotor) which distorts and cuts through the magnetic lines of flux of the stator. When the rotor cuts through lines of magnetic flux it makes electricity. Thus mechanical energy is converted into electrical energy.