Electricity

1 Standard Circuit Diagram Symbols Draw and interpret circuit diagrams using standard symbols. Spec 6.2.1.1 2 Electrical Charge and Current Describe electric current as flow of charge and calculate charge, current and time. Spec 6.2.1.2 3 Current, Resistance and Potential Difference Apply Ohm's Law (V = IR) to calculate current, resistance and potential difference. Spec 6.2.1.3 4 Resistors Describe I–V characteristics of resistors, lamps, diodes, thermistors and LDRs. Spec 6.2.1.4 5 Series and Parallel Circuits Calculate current, potential difference and resistance in series and parallel circuits. Spec 6.2.2 6 Direct and Alternating Potential Difference Distinguish dc and ac, state UK mains values and read oscilloscope traces. Spec 6.2.3.1 7 Mains Electricity Describe three-core cable colour coding, the earth wire, fuses and electrical safety. Spec 6.2.3.2 8 Power Calculate electrical power using P = VI and P = I²R, and select appropriate fuse ratings. Spec 6.2.4.1 9 Energy Transfers in Everyday Appliances Calculate energy transferred using E = Pt, use kWh and describe appliance energy transfers. Spec 6.2.4.2 10 The National Grid Explain how the National Grid transmits electricity efficiently and the role of transformers. Spec 6.2.4.3