Electromagnetism

• How to make an electro magnet

  Connect one end of the wire with a crocodile clip to the battery and wrap the wire tightly around the metal nail. After this connect the other end of the wire to the battery. Turn on the battery. If you move the electromagnet closer to the paper clips, it should attract them. If you disconnect the wire the paper clips fall.
• How to increase the power of an electromagnet

  the number of coils of wire

  the current in the wire

  using a magnetic core inside the coil of the wire
• Example of electromagnet use

  RELAYS can improve safety by using a small current to switch on a circuit that carries a much bigger current
• Electromagnet

  Requires a "soft" material wrapped in a current conducting wire