Electromagnetism, Properties Of Waves, Motion, Gases & The Kinetic Theory Worksheet With Answers Page 4
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36Electromagnetic Induction
Magnetic field lines
If a metal wire is forced to move
through a magnetic field (or a
magnetic field is moved through a
wire), a voltage is produced across
N
the wire.
S
If this wire is part of a complete
circuit, this voltage will push a
current around the circiut.
Another way of saying this would be :
Wire
electricity is induced
0
“
1
1
mA
(created) when a wire CUTS
2
2
through magnetic field
lines
”.
Wire is forced downwards, cutting
through the field.
As you can see in the diagrams below, it makes no difference whether it’s a magnet turning
inside a coil, or a coil turning inside a magnetic field, the effect is the same – electricity is
induced in the coil.
coil rotating
N
S
carbo
Coil
n
brush
contact rings
A ‘dynamo’ on a bicycle wheel
A small generator, e.g. a wind up torch
Generators are a crucial part of all power stations (except for solar PV).
Shown below is a wind turbine – the generator can be seen at the back.
Here’s a
generator from a
hydroelectric
power station
4
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education