How electricity is generated in Dynamo
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Answers
⊙ It's not practical to generate electricity by passing magnet in and out of a coiled wire.
⊙ Instead , generator induce a current by spinning a coil of wire inside a magnetic current.
⊙ Eg :- Bicycle Dynamo
DEAR STUDENT
*** WHAT IS DYNAMO ??.....
---A dynamo works on the principle of Faraday's law of electromagnetic induction........... The dynamo is a small version of a generator.......... It has stationary magnets which will create powerful magnetic field.......... By electromagnetic induction when a conductor is placed in a magnetic field , a flux is induced in the circuit by which current start to flow in the rotor...........
*** MATERIALS NEEDED ARE.......
--- Permanent Magnet
--- Insulated Copper wire: A rectangular rotating coil of wire ABCD
--- Axle: axle is where the split rings are placed.......It is made to rotate freely from an external source.
--- Split Rings: Two disjoint C-shaped rings R1 and R2 are internally attached to the Axle.. Ends of the coil are connected to R1 and R2. The inner portion of these rings are made of non-conducting material
--- Galvanometer : To measure current. The outer ends of the brushes are connected to the galvanometer to measure the current
--- Brushes: The outside of the split rings are connected to conducting brushes B1 and B2. B1 and B2 is kept pressed on R1 and R2 respectively.
*** WORKING OF GENERATOR......
--- The axle of the dynamo is rotated in clockwise direction such that it moves in the clockwise directions that is CD moves down and AB moves up ..........
According to Fleming's Right Hand rule, the induced current is setup in the coil along B1------AB ------BC ----- CD -----B2. So the external current flows from B2 to B1.
After half rotation, arm CD starts to move up and AB moves down.
Thus after every half the rotation of the coil, the current changes direction. This is called an Alternating current (AC) current.
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