What is the primary function of an electromagnetic relay?
To convert an alternating current (a.c.) into a direct current (d.c.).
To allow a small current in one circuit to switch a much larger current in a separate circuit.
To increase or decrease the voltage of an alternating current (a.c.) supply.
To convert electrical energy into mechanical 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.