electricity

• what are these symbols?

  A) wire

  B) resistor

  C) battery

  D) cell

  E) voltmeter

  F) motor

  G) switch (open)

  H) swtich (closed)

  I) lamp

  J) buzzer

  
• conservation of energy


  energy cannot be created or destroyed
• protons

  • positive charge
  • inside the nucleus
• electrons

  • negative charge
  • orbit the nucleus
• neutrons

  • neutral/no charge
  • inside the nucleus
• static electricity

  • two insulators rub together
  • creates friction
  • electrons are transferred from one material to another
  • the material with extra electrons will become negatively charged
  • the material that has lost electrons will become positively charged
• electric shock

  • insulators trap the electrons rather than letting them pass
  • therefore charge builds up on the material
  • when a conductor is touched, the charge flows off causing an electric shock
• hazard

  the object, chemical or situation that can hurt you
• risk


  the harm that could be caused by a hazard
• precaution

  what can be done to minimise the risk from happening