Magnets and Electromagnets

1
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

2
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

3
The Circuit Breaker

• Explain how the circuit breaker works by
  arranging the statements in the correct order.
• Extra The Electric Bell

4
Uses of Electromagnets

• In scrap yards and factories
• Electric buzzers
• Electric bells
• Relay switches
• Circuit breakers