Electromagnets
- Created by: Lilycmxx
- Created on: 27-03-20 13:22
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- Electro-magnets
- When an electric current flows in a wire, it creates a magnetic field around the wire.
- This effect can be used to make an electromagnet
- A simple electromagnet comprises a length of wire turned into a coil and connected to a battery or power supply.
- This effect can be used to make an electromagnet
- Making an electro-magnet stronger
- Wrap the coil around a piece of iron
- Add more turns to the coil
- Increase the current flowing through the coil
- Advantages of Electro-magnets
- They can be turned on and off
- The strength of the magnetic field can be varied
- The magnetic field around an electromagnet is just the same as the one around a bar magnet.
- It can, however, be reversed by reversing the current (turning the battery around).
- The magnetic field around an electromagnet is just the same as the one around a bar magnet.
- DC Motors
- To make a simple DC Motor you need:
- Two bar magnets
- A coil of wire wrapped around something to support it
- An axle for the coil of wire to spin around
- two half rings (‘split rings’)
- Motor Effect
- Electric motors use the forces produced by magnetic fields to produce a turning motion.
- If you put a length of wire in a magnetic field and pass a DC current through it (such as from a battery), the wire will move.
- Electric motors use the forces produced by magnetic fields to produce a turning motion.
- To make a simple DC Motor you need:
- Electric Bell
- The switch is open and the metal arm is away from the gong.
- The switch is closed. An electric current flows through the electromagnet, producing a magnetic field.
- The metal arm is attracted to the electromagnet
- It hits the gong which makes a sound.
- The circuit is broken and the electromagnet turns off.
- The metal arm springs back. The contacts touch and the circuit is complete again.
- The circuit is broken and the electromagnet turns off.
- It hits the gong which makes a sound.
- The metal arm is attracted to the electromagnet
- The switch is closed. An electric current flows through the electromagnet, producing a magnetic field.
- The switch is open and the metal arm is away from the gong.
- When an electric current flows in a wire, it creates a magnetic field around the wire.
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