ELECTROMAGNETIC INDUCTION

ELECTROMAGNETIC INDUCTION

ELECTROMAGNETIC INDUCTION

ELECTROMAGNETIC INDUCTION The induced current increases if: 1. The magnet ( or coil) moves faster, 2. The magnet is stronger, 3. The coil has more turns. 4. The coil has a larger area.

ELECTROMAGNETIC INDUCTION Ammeter Ammeter Ammeter ELECTROMAGNETIC INDUCTION The induced current increases if: 1. The magnet ( or coil) moves faster, 2. The magnet is stronger, 3. The coil has more turns. 4. The coil has a larger area.

Voltage / V 2 0.01 0.02 -2 time /sec Voltage / V 2 0.01 0.02 -2 time /sec

V peak = 1.0 V T= 0.01 sec F = 1 = 100Hz T Voltage / V 2 0.01 0.02 -2 time /sec Voltage / V 2 0.01 0.02 -2 time /sec

V peak = 1.0 V V peak = 2.8 V T= 0.01 sec F = 1 = 100Hz T T= 0.005 sec Voltage / V 2 T= 0.01 sec F = 1 = 100Hz T 0.01 0.02 -2 time /sec V peak = 2.8 V Voltage / V 2 T= 0.005 sec F = 1 = 200Hz T 0.01 0.02 -2 time /sec

What is wrong with the output voltage comparison? V peak = 1.0 V Voltage / V 2 T= 0.01 sec F = 1 = 100Hz T 0.01 0.02 -2 time /sec V peak = 2.8 V Voltage / V 2 T= 0.005 sec F = 1 = 200Hz T 0.01 0.02 -2 time /sec What is wrong with the output voltage comparison?

The AC generator These magnets can be made very powerful using electromagnets Metal or carbon brushes The AC generator

Electromagnetic induction What will happen if you move a magnet into a coil of wire? A current is induced in the coil. Only when the magnet is moving.

Stationery magnet What happens when the magnet is in the coil? Nothing!! A current is only induced when the magnet is moving.

Electromagnetic induction What will happen if you move the magnet out of the coil of wire? A current is induced in the coil. This time in the opposite direction. If you reverse the direction of the movement, then you reverse the direction of the current.