1. ELECTROMAGNETIC INDUCTION

2. ELECTROMAGNETIC INDUCTION

3. ELECTROMAGNETIC INDUCTION

4. 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.

5. 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.

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

7. 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

8. 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 = = 100Hz T
0.01
0.02 -2
time /sec
V peak = 2.8 V
Voltage / V 2
T= sec
F = = 200Hz T
0.01
0.02 -2
time /sec

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

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

12. 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.

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

14. 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.