A voltmeter is connected across a motor. In one test, the motor transfers 540 J while 45 C passes through it. In a second test, it transfers 720 J while 80 C passes through it.
What happens to the voltmeter reading?
It increases by 25%25\%25%.
It decreases by 33%33\%33%.
It decreases by 25%25\%25%.
It increases by 33%33\%33%.
94 exam-style questions on Edexcel GCSE Physics 10.1 Circuits, charge and current, covering 10.1.1 Structure of the atom, 10.1.2 Circuit diagrams and symbols, 10.1.3 Series and parallel circuits, 10.1.4 Potential difference and voltmeters, 10.1.5 Energy transferred, charge and potential difference, and 10.1.6 Current, ammeters and charge flow. Each one has a worked solution and a mark scheme showing where the marks go.