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.
67 exam-style questions on CIE IGCSE Physics 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.