An engineer investigates a halogen spotlight designed for a 12 V12\text{ V}12 V portable lighting system.
Graph measurements show that when the spotlight is first switched on, the current momentarily spikes to a peak before settling down to a normal operating current of 2.5 A2.5\text{ A}2.5 A.
Calculate the normal operating power of the spotlight.
Use the equation:
power=potential difference×current \text{power} = \text{potential difference} \times \text{current} power=potential difference×currentExplain why the initial current is much higher than the normal operating current of 2.5 A2.5\text{ A}2.5 A when the spotlight is first switched on.
39 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.