GCSE · Physics · AQA · Spec 8463
Current, resistance and potential difference (V = I R)
How potential difference, resistance and current interact
Follow the chain — see how each quantity depends on the others before you apply the equation
Stop and think
Commit to an answer before you reveal — this is the moment that locks in understanding.
A circuit has a potential difference of 6 V and a resistance of 3 Ω, giving a current of 2 A. The resistance is then increased to 6 Ω while the potential difference stays at 6 V. What is the new current?
Why does more resistance mean less current?
Reason it through
Why does increasing the resistance of a component reduce the current through it, when the potential difference is kept the same?
First link · your turn
What does potential difference actually do to charges in the circuit?
Relationship matrix
Tap any cell to reveal it. Tap a column header to read one property down every item.
Each cell hides a short answer and the reason behind it. Predict before you tap.
AQA 8463 — Exam technique
AQA mark scheme practice
Does your answer hit every marking point?
Question
A resistor has a resistance of 25 Ω. The potential difference across it is 5 V. Calculate the current through the resistor. Show your working. [4 marks]
Student answer
The equation is V = I R. Rearranging for current: I = V divided by R. Substituting: I = 5 divided by 25. Current I = 0.2 A.
Equations you need
Taken directly from the exam-board specification.
V = potential difference (V) · I = current (A) · R = resistance (Ω)
Learn it — you must recall this in the exam
WHAT YOU'VE LEARNED
A quick recap of today's lesson.
How V, I and R are linked — and why every circuit obeys the same rule
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