Electricity yr 11

• Current from power station is AC
• Household circuit is 230 V
• • Live wire -brown
  • Earth wire -green and yellow
  • Neutral wire -Blue
• Fuse always connected to live

  Cable grip to prevent cable from being pulled out
• Live wire changes passes along an AC current and is the most dangerouse
• Neutral wire returns the electricity to the generator and is generally kept at 0 V
• Earth wire- its a safety wire which connect the metal part of the appliance to the earth and stops it becoming live .
• Some appliances dont have an earth wire as they are double insulated
• Power is the rate of energy conversion (per second)

  P=IV

  power is measured in W or J/s
• Fuses are included in a plug as a weak link for safety and incase of a fault and too much current flows, a thin wire will melt to prevent any further damage.

  Always connected with live wire as its the most dangerouse
• A circuit breaker is an automatic switch which turns off when the current rises above a specific value. It can be reset
• Electrical Unit: kWh

  E=Pt (J)(W)(s) & (kWh)(kW)(h)
• Conductors have free electrons which allow a current to flow