This key facts covers Key Facts Summary within Potential Difference for GCSE Physics. Revise Potential Difference in Electricity for GCSE Physics with 14 exam-style questions and 30 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 8 of 14 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
📋 Key Facts Summary
- Potential difference equation: V = E / Q
- Voltage unit: volts (V)
- 1 volt = 1 joule per coulomb
- Voltmeter connected in parallel
- Series circuit: voltages add up to supply voltage
- Parallel circuit: voltage is the same across each branch
- More resistance in a series circuit → bigger voltage share
Quick Check: In a series circuit, a battery has p.d. = 9 V. One component has 4 V across it. What is the voltage across the second component?
In a series circuit, voltages add up to the supply: V₂ = 9 − 4 = 5 V.
Practice questions for Potential Difference
Which of the following is the correct definition of potential difference?
Explain what is meant by a potential difference of 6 V across a component.