A student builds a circuit to operate a lamp in a model lighthouse. The lamp and a 6.0 V battery are connected in series with a 100 Ω resistor. The student replaces the resistor with a 10 Ω resistor. An ammeter in the circuit shows that the current has increased. Which statement explains why the current has increased?
The total resistance of the circuit is lower, and the battery potential difference is the same.
The resistor now takes a smaller share of the current, so more is left for the lamp.
The 10 Ω10\ \Omega10 Ω resistor gives the charge an extra path, so more current can flow.
The lamp now uses up less of the current, so more current returns to the battery.
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.