A student connects a resistor in series with a battery, a switch and an ammeter.
State the equation linking potential difference, current and resistance.
The potential difference across the resistor is 6.0 V.
The current in the resistor is 0.30 A.
Calculate the resistance of the resistor.
Give the unit.
The student opens the switch.
State what happens to the reading on the ammeter. Give a reason for your answer.
81 exam-style questions on Edexcel GCSE Physics 10.2 Resistance, covering 10.2.1 Current in a circuit and conservation at junctions, 10.2.2 Resistance and variable resistors, 10.2.3 Series and parallel resistance, 10.2.4 I–V characteristics of components, and 10.2.5 LDRs and thermistors. Each one has a worked solution and a mark scheme showing where the marks go.