P4 Revision Notes


Positive charge - protons

Negative charge - electrons

The negative change moves when friction occurs


Charged jumps can lead to sparks

These are dangerous in inflammable atmospheres:

  • fuel stations
  • grain silos

This can be prevented by earthing the system

Attaching the conductor to the ground to rid of the charges.

Power = voltage X current

Power is the unit of electricity

KWh = hours of use X Power in


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