USING TRANSFORMERS TO CHANGE VOLTAGES
3 marks · EasyA transformer has 200 turns on its primary coil and 800 turns on its secondary coil.
(a)[1 mark]
State whether this is a step-up or step-down transformer.
(b)[2 marks]
If the voltage across the primary coil is 5 V, calculate the voltage across the secondary coil.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Step-up transformer
(b) 20 V
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States this is a step-up transformer.
M1 (b) · 1 mark · Uses the transformer equation correctly:
A1 (b) · 1 mark · Gives
Worked solution
a) The secondary coil has more turns than the primary coil, so it is a step-up transformer.
b)