Available practice: 75 of 80 marks. Parts 3(b), 6(a)(i) await marking support. Scores cover available parts only.
There are 8000 turns in the primary coil of the transformer. The primary coil is connected to a 240 V mains supply. A 6.0 V lamp connected to the secondary coil operates at full brightness.
(a)Calculate the number of turns in the secondary coil.
Answer guidance
Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.
[2 marks]
A transformer has 8000 turns in the primary coil connected to a 240 V mains supply, and a 6.0 V lamp connected to the secondary coil operating at full brightness. The current in the lamp is 2.0 A. The transformer operates with 100% efficiency.
(b)Calculate the current in the primary circuit.
Answer guidance
Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.