Electricity

• A parallel circuit is a circuit in which the components are connected across multiple paths, so the current splits and flows through each component simultaneously.
•  Any circuit problem can be solved by using a combination of Ohm’s law (V= IR), the current laws and the voltage laws.
• Current is the flow of electrons (charged particles) around a circuit.
• Voltage refers to the difference in charge between the positive and negative ends of the cell.
• The bigger the potential difference, the bigger the force on the electrons 
• The field lines point away from a positive source and towards a negative source.
• A fuse protects an electrical device. It contains a thin piece of wire which will melt and break the circuit if the current is too high. This prevents damage to the device.
• if live wire (brown) breaks, the electric current would flow thru the earth wire, preventing the outside of the device becoming live
• The neutral wire (blue) is at 0V
• The voltage supplied to the device is the difference between the live and neutral wire
• step up transformer - more turns on secondary coils
• Step down transformer - more turns on primary
• Ohm’s law states that current is directly proportional to potential difference (providing the temperature remains constant). Bc of V=IR