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Paper 1
Electricity
Both
Label current and voltage in every circuit question.
Key Facts
- V = IR is the most common formula.
- Power = IV or I^2R or V^2/R.
Key Equations
V = IR
P = IV
Q = I × t
Topics Covered
Current, Voltage, Resistance
What you need to know
- •Current is flow of charge.
- •Voltage is energy per charge.
- •Resistance opposes current.
Exam Tips
- Use V = IR; show the formula.
Series & Parallel Circuits
What you need to know
- •Current same in series.
- •Voltage shares in series, same in parallel.
Exam Tips
- Draw the circuit and label currents.
Key Terms
Potential difference
Energy transferred per coulomb of charge.
Resistance
Opposition to current flow.
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Common Exam Questions
A resistor has 9 V across it and 0.3 A through it. Find R.
2 markseasyPaper 1
Model Answer
30 ohms
What examiners want to see
- ✓Use V = IR and rearrange.
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