A voltmeter joined across two points P and Q in an electrical circuit gives a reading of $1\,\text{V}$. Which statement is correct?
- AThe energy needed to move $+1\,\text{C}$ of charge from P to Q is $1\,\text{J}$.
- BThe energy needed to move $+1\,\text{C}$ of charge from Q to P is $1\,\text{J}$.
- CThe energy needed to move one electron from P to Q is $1\,\text{J}$.
- DThe energy needed to move one electron from Q to P is $1\,\text{J}$.