Which statement correctly describes the main function of an electromagnetic relay in an electrical circuit?
It converts alternating current into direct current.
It uses a small current in one circuit to safely switch on or off a larger current in a separate circuit.
It increases the voltage of an electrical supply while decreasing the current.
It automatically decreases its resistance when the temperature of the surroundings rises.
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.