State the hazards of: (a) damaged insulation (b) overheating cables (c) damp conditions (d) excess current from overloading of plugs, extension leads, single and multiple sockets when using a mains supply

Recall and use the equation P = I²R to explain why power losses in cables are smaller when the voltage is greater

Describe the effect on the magnetic field around straight wires and solenoids of changing the magnitude and direction of the current