Potential Difference
Potential difference is the work done per unit charge between two points in a circuit.
Practice This ConceptMain explanation
Teacher explanation
It tells us how much energy is given to each coulomb of charge when it moves from one point to another. A higher potential difference means a stronger push on charges. The SI unit is volt.
Example
A 9 V cell gives 9 J of energy to each coulomb of charge passing through it.
Simple analogy
Voltage is energy per coulomb.
Common confusion
Students often confuse potential difference with current or treat voltage as total energy.
Exam tip
Remember that voltage is always between two points, not at a single point alone.
Answer writing and exam use
1-mark use
Write the exact meaning of potential difference in one clean line.
2-mark use
Define potential difference and add one example or condition.
3-mark use
Explain potential difference, show the method or example, and mention the common mistake.
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