2.5 Charge, Current, Voltage, Resistance and Circuits
Conductors and insulators, charge flow, current, voltage, circuit symbols, cells, Ohm's law, V-I graphs, and series and parallel rules.
How to study for CCEA GCSE Physics
Link every equation to a physical model and unit, interpret graphs and evidence, and prepare each prescribed practical from method through evaluation.
Core concepts
Concept 1
Current is charge flow per unit time, while voltage is energy transferred per unit charge.
Exam cue: Confirm the CCEA unit, tier and whether the task tests a model, calculation, explanation or practical judgement.
Concept 2
Ohm's law links voltage, current and resistance for an ohmic conductor at constant temperature.
Exam cue: Place ammeters in series and voltmeters in parallel, keep current and voltage rules distinct and interpret the V-I graph axes used by CCEA.
Concept 3
Series circuits share current and divide voltage; parallel branches share voltage and split current.
Exam cue: Show substitutions and units, connect evidence to the physical model and limit the conclusion to the stated conditions.
Risk pitfalls and guardrails
Saying current is used up by a component or connecting a voltmeter in series.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a causal physical explanation with an equation alone.
Importing an equation sheet, Higher-only boundary or paper convention from an England 9-1 board.
Guardrail: Use the current CCEA formatting to confirm Higher-only content and the correct paper duration; do not infer tier scope from another exam board.
Giving a calculator display or named law without the working, units, causal explanation or evidence the command word requires.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a causal physical explanation with an equation alone.
Memory anchors
Current
Rate of flow of electric charge.
Voltage
Energy transferred per unit charge.
Resistance
Opposition to current, equal to voltage divided by current.
Ohm's law
At constant temperature, current is proportional to voltage for a metal conductor.
Series circuit
A circuit with one current path through successive components.
Parallel circuit
A circuit with branches connected across common points.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
During a 40 s interval, a circuit carries a steady 2.5 A. Calculate the total charge transferred.
Complete the physical interpretation of I=Q/t: electric current describes which rate?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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