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Physics · Combined Science

Electricity

Spec 4.2 Paper 1 📙 Higher

Subtopics

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

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Key Equations

Q = It

V = IR

P = VI

P = I²R

E = Pt

E = QV

⭐ Higher Tier Content

Potential divider circuits

Vout = Vin × R2/(R1+R2)

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