THE TRANSFORMER
2 marks · EasyA transformer has 200 turns on its primary coil and 400 turns on its secondary coil. The input voltage is 10 V a.c.
Calculate the output voltage from the secondary coil.
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20 V (±0.5)
Also accept: 20; 20.0
Common mistakes: Doubling the input voltage without working
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Uses the correct transformer equation:
A1 · 1 mark · Correctly calculates output voltage V_s = 20 V.
Worked solution
Substitute the values: