Transformers are used in the transmission of electrical energy from power stations to consumers.
Which row in the table correctly describes the effect on voltage of the transformer used at the power station prior to the transmission lines, and the transformer used at the substation prior to delivery to consumers?
At the power stationAt the local substationADecreases the voltageDecreases the voltageBDecreases the voltageIncreases the voltageCIncreases the voltageDecreases the voltageDIncreases the voltageIncreases the voltage \begin{array}{|c|c|c|} \hline & \text{At the power station} & \text{At the local substation} \\ \hline \text{A} & \text{Decreases the voltage} & \text{Decreases the voltage} \\ \hline \text{B} & \text{Decreases the voltage} & \text{Increases the voltage} \\ \hline \text{C} & \text{Increases the voltage} & \text{Decreases the voltage} \\ \hline \text{D} & \text{Increases the voltage} & \text{Increases the voltage} \\ \hline \end{array} ABCDAt the power stationDecreases the voltageDecreases the voltageIncreases the voltageIncreases the voltageAt the local substationDecreases the voltageIncreases the voltageDecreases the voltageIncreases the voltageRow A
Row B
Row C
Row D
275 exam-style questions on CIE IGCSE Physics 4.5 Electromagnetic effects, covering 4.5.1a Electromagnetic induction, 4.5.1b Direction of an induced e.m.f., 4.5.2 The a.c. generator, 4.5.3a Magnetic effect of a current and its applications, 4.5.3b Strength and direction of the field around wires and solenoids, 4.5.4a Force on a current-carrying conductor, 4.5.4b Force on beams of charged particles, 4.5.5 The d.c. motor, 4.5.6a Construction and operation of a transformer, 4.5.6b Turns ratio and current in a transformer, and 4.5.6c High-voltage transmission of electricity. Each one has a worked solution and a mark scheme showing where the marks go.