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  1. conduct To allow electricity, heat or other energy forms to pass through.
  2. earthed Connected to the ground directly or indirectly so that electric charge flows from an object, preventing a dangerous build-up of static electricity.
  3. electron Sub-atomic particle, with a negative charge and a negligible mass relative to protons and neutrons.
  4. force A push or a pull. The unit of force is the newton (N).
  5. frictional force Force that resists one object moving through or over something. An example is air resistance on a car.
  6. ignite Set on fire.
  7. insulator Material that does not allow charge or heat to pass through it easily.
  8. neutral An object that does not have a positive or negative charge.