Electricity and Magnets

• What type of force is magnetism?

  Non-contact
• Which metals are magnetic?

  Iron, nickel, cobalt
• A bar magnet is a permanent magnet.
• An electromagnetic is a temporary magnet.
• What is the proper name for the coil in a electromagnetic?

  Solenoid
• In a electromagnet there is a solenoid, metal core and power pack.
• To make an electromagnet stronger you can increase the current, increase the number of turns or add a metal core.
• What is the symbol for current?

  amps (A)
• What is the definition of current?

  The rate of flow of charge (electrons)
• What is the symbol for voltage?

  Volts (V)
• What is the definition of voltage?

  The size of the ‘push’ that causes current to flow around a

  circuit
• What is the symbol for resistance?

  Ohms (Ω)
• What is the definition of resistance?

  The opposition in the flow of electrons in the circuit.
• What causes static to build up?

  Friction
• From top to bottom what is the geographical north and south?

  North then south
• From top to bottom what is the magnetic north and south?

  South then north