Physics

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What is an electromagnet?
An insulated wire wrapped round an iron bar which becomes magnetic when current is passed though it
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What is a magnetic field?
The space around a magnet or a current-carrying wire
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How can you show a magnetic field?
place a magnet in some iron fillings
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How do you plot a magnetic field?
A bar magnet surrounded by compasses
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How is an electromagnetic created?
A wire is placed around an iron core, current is then passed through it causing it to become magnetised
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Name two uses for electromagnets
The scrapyard crane, circuit breaker, electric bell or The relay
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How does a scrapyard crane work?
Scrap vehicles are lifted in a scrap yard powerful electromagnets attached to cranes. The steel frame of a vehicle sticks to the electromagnet when current passes through the coil of the electromagnet. When the currents is switched off, the frame off
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How can you increase the size of the force in an electromagnet?
Have a stronger magnet/core, increase the size of the current
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How does an electric bell work?
When the current flows through the circuit, the electromagnet makes a magnetic field. The electromagnet attracts the springy metal arm. The arm hits the gong, which makes a sound. The circuit is broken now the arm is out of position.
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Other cards in this set

Card 2

Front

What is a magnetic field?

Back

The space around a magnet or a current-carrying wire

Card 3

Front

How can you show a magnetic field?

Back

Preview of the front of card 3

Card 4

Front

How do you plot a magnetic field?

Back

Preview of the front of card 4

Card 5

Front

How is an electromagnetic created?

Back

Preview of the front of card 5
View more cards

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