Physics, topic 7, electromagnetism
- Created by: Whitechoc10001
- Created on: 22-02-20 10:11
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- electromagnetism
- electromagnets and magnets
- magnets
- wires
- charge going through a wire creates a magnetic field
- solenoid: coil of wire
- increase strength of solenoid by increasing coils, increasing current
- electromagnet
- put an iron bar in a solenoid
- an be switched on and off
- can be used in alarms
- the motor effect
- when a current in a wire is perpendicular to a magnetic field there is another perpendicular force.
- F=BIL
- F=force (newtons, N)
- B=magnetic flux density (tesla, T)
- I=current (amps, A)
- L=length (metres, m)
- uses
- electric motors
- an entire coil goes through a magnetic field
- one side goes up, one goes down
- the two ends of the wire alternate between split rings and keep it going
- one side goes up, one goes down
- an entire coil goes through a magnetic field
- loud speakers
- the magnet and wire do motor effect and the solenoid pushes outward
- this moves the paper cone, creating vibrations and sound
- the magnet and wire do motor effect and the solenoid pushes outward
- electric motors
- generator effect
- creating a PD in a wire which is moving in relation to a magnetic field
- backwards motor effect
- pass a magnet through a solenoid, to produce a PD
- spin magnet in solenoid to produce AC
- increase PD by increasing speed or strength of magnet
- uses
- generator
- microphone
- backwards speaker
- set up speaker with no PD
- sound waves push paper cone, causing magnet to move
- creates PD, linked to speaker
- sound waves push paper cone, causing magnet to move
- transformers
- step up transformer
- increase PD
- decrease current
- more turns in secondary coil
- step down transformer
- decrease PD
- increase current
- more turns in primary coil
- VsIs=VpIp
- Is= secondary current
- Untitled
- Vp/Vs=Np/Ns
- Np=turns in primary coil
- Ns=turns in secondary coil
- Vp= PD in primary coil
- VsIs=VpIp
- Is= secondary current
- Untitled
- VsIs=VpIp
- Vs=PD in secondary coil
- step up transformer
- electromagnets and magnets
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