Which statement correctly describes the primary function of an electromagnetic relay?
It converts a high input voltage into a lower output voltage to power small electronics.
It uses a small current in one circuit to magnetically switch and control a much larger current in a separate circuit.
It acts as a safety device that automatically melts and breaks the circuit if the current becomes too large.
It stores electrical energy in an electric field to smooth out fluctuations in the supply voltage.
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.