A water-quality monitor has two resistors connected in parallel across a supply. A third resistor is added in parallel, while the supply potential difference remains unchanged.
What happens to the total resistance of the resistors?
It decreases because the charge has an extra path
It stays the same because the supply potential difference is unchanged
It increases because the total current is shared between more branches
It becomes equal to the resistance of the added resistor
94 exam-style questions on AQA GCSE Physics 2.2 Series and parallel circuits, covering 2.2 Series and parallel circuits. Each one has a worked solution and a mark scheme showing where the marks go.