Which statement correctly describes the function of an electromagnetic relay in an electrical circuit?
It transforms a low alternating voltage into a high alternating voltage.
It automatically breaks a circuit when the current exceeds a safe maximum level.
It uses a small current in one circuit to close a switch and control a much larger current in another circuit.
It stores electric charge and releases it quickly to provide a burst of energy.
136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.