electricity in home

• alternating current are produced by alternating voltages in which positive and negative alternate
• direct current is a current that flows in one direction only, it is always the same direction
• uk mains supply is 230v and frequency is 50hz
• live wire is brown and provides alternating potential difference at 230v
• earth wire is green and yellow and takes electricity to ground if there is any issue
• neutral wire is blue and it completes the circuit from the appliance back to the supply
• a fuse is a device that melts when the current is too high and stops the circuit
• cable grips are insulated and grip cable in place
• electrical appliances are designed to transfer energy to components in a circuit when a current flows
• kettle transfers energy electrically from mains ac supply to thermal energy store of the heating element of kettle
• energy is transferred electrically from the battery of a handheld fan to kinetic energy store of fans motor
• energy transferred = power x time ( e=pt)