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Magnets and Electromagnets
Magnets exert forces at a distance on magnetic materials like iron and steel Magnets pull and push other magnets N-N repel S-S repel N-S attract A coil of wire carrying a current is called an electromagnet It makes a magnetic field just like a bar magnet which is stronger at the ends Reversing the current reverses the poles at the ends
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Electromagnets The strength of the electromagnet can be increased by:
More turns of the coil Using an iron core Increasing the size of the current
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The Circuit Breaker Explain how the circuit breaker works by arranging the statements in the correct order. Extra: The Electric Bell
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Uses of Electromagnets
In scrap yards and factories Electric buzzers Electric bells Relay switches Circuit breakers
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