An engineer tests a fixed resistor that will be used in the warning-light circuit of a car. The temperature of the resistor stays constant during the test.
When the potential difference across the resistor is 3.0 V, the current through it is 25 mA.
Calculate the resistance of the resistor.
In the car, the potential difference across the resistor will be 14 V. The current through the resistor must not be greater than 0.10 A.
Determine whether the resistor is suitable.
82 exam-style questions on AQA GCSE Physics 2.1 Current, potential difference and resistance, covering 2.1.1 Standard circuit diagram symbols, 2.1.2 Electrical charge and current, 2.1.3 Current, resistance and potential difference, and 2.1.4 Resistors. Each one has a worked solution and a mark scheme showing where the marks go.