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KLZZlhVNbcOhPxwbdGOe

Explore the principles of electric motors and electromagnetism, including the motor effect, Fleming's rules, and the role of magnetic fields in current-carrying wires. This summary covers key concepts such as solenoids, induced emf, and the interaction of magnetic fields, providing a comprehensive understanding for students studying physics.

Electric Motors & Electromagnetism

Revision note

Amalia Dodds

United Kingdom

Study note

English (US)

electromagnetism

DEFAULT (England)

Science

AP Physics 1

Electromagnetism

Newton's Laws

Vector Fields

ELECTROMAGNETISM
a g
when a current flows through a wire, a magnetic field is created
around it.
Flemings right hand rule (thumbin direction of current)
field of concentric circles.
piacing a compass neard current carrying wire moving the compass
cuusesic to 'crace' direction of magnetic field.
N
mag. field
insida Suienvid
is strong and unicorm
et
(magnetic field in
→→
Field lines very close together so field is
Stronger when you increase coils..
electromagnet - Soienord with an ironcore (magnetic field) can be turned
on and off with an electric current.
Iron core becomes an induced mogner-
magnek exerts a force on the conductor
causes the wire to move
MOTOR EFFECT
Current carrying wire placed between magnetic poies
2 magnetic fields interact.
G increasing magnetic field Strength.
increasing length.
Fleming's left hand ruler
first cleid
Second currenc
thumbmotion
in a sulenula).
to experience fuil force, wite will be at 90° to magnetic field.
increase Strength/force acting on conductor
0 increasing current
current.
motors vs generator
mocars current couses movement
generator=movement causes -
ELECTRIC MOTORS!
forces on either side of the cociaat in opposite directions due
to current carrying wire producing its own magnetic field?
which interaces by field produced by permanent magnets.
wire experiences a Force which acts on either side in opposite
directions
Split ring communicautor
*Swaps connection every
huit turn.
Switches direction of current
1 Swaps forces
keeps turning in Same direction.
directions of motor
can be reversed by:
-Swapping puiurity of
Ich supply
N
4000
current
-reversing
• reversing field by.
Swapping magnetic
poles
MOTOR EFFECT = LOUDSPEAKERS
(1) alternating current through call of wire
attached to base of papercone.
N
2) coll Surrounds one paie of a a magnet and
is Surrounded by another so the interachny
magnetic fields cause a force on the coll.
ас.
3) force on the coil causes a cose to move. When currents reversed:
the forces orch in the opposite direction which causes the cone to
move in the opposite direction coo.
4) crariatrons in ourent make cone Vibrate.
5) air around the cone vibrates
6) creates changes in pressure that causes a sound wave.
7) frequency of Soundwave the same as frequency of ac.

Electromagnetism

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Electromagnetism

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Can't find what you're looking for? Explore other subjects.

Knowunity is the # 1 ranked education app in five European countries

Knowunity was a featured story by Apple and has consistently topped the app store charts within the education category in Germany, Italy, Poland, Switzerland and United Kingdom. Join Knowunity today and help millions of students around the world.

4.9+

20 M

#1

950 K+

Still not sure? Look at what your fellow peers are saying...

I love this app so much [...] I recommend Knowunity to everyone!!! I went from a C to an A with it :D

The application is very simple and well designed. So far I have found what I was looking for :D

Love this App ❤️, I use it basically all the time whenever I'm studying