Mains electricity- ks3

• Potential difference is the ammount of energy transferred from the battery to the charges flowing around the circuit.
• There are two main wires, the live wire and the neutral wire
• The live wire goes from the power source to the appliance. It is brown, and has 230V.
• The neutral wire goes from the appliance back to the power source to complete the circuit.. It is blue and has 0V.
• 1 watt, is equal to 1000 kwh.
• A fuse is a safety device that prevents a high current from flowing through the circuit.
• The fuse is made from a substance with a low melting point. When a high current flows through, it melts, breaking the circuit.
• Direct current travels in one direction.
• Alternating current changes direction 50 times each second.
• Power is the rate of energy transfer.
• Current is the rate of the flow of charge.
• Resistance is anyting that slows down current.
• The earth wire is a safety wire that completes the circuit and prevents the appliance from becoming live.