A transformer is connected to an AC mains supply of 230 V. The primary coil has 4600 turns. The output of the secondary coil is to be connected to two identical lamps. To operate at full brightness, each lamp requires a potential difference of 12 V. At a lower voltage, the lamps will still light up but will be dimmer.
State how the two lamps should be connected across the output of the transformer so that they both operate at full brightness. Explain your answer.
Calculate the number of turns needed in the secondary coil to provide an output voltage of 12 V.
The two lamps are now connected in series across the output of the transformer. Describe and explain the effect on the brightness of the lamps.
136 exam-style questions on CIE IGCSE Physics 4.5.6a Construction and operation of a transformer. Each one has a worked solution and a mark scheme showing where the marks go.