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.
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.