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The primary coil of a transformer has N turns and is connected to a 120 V a.c. p...


Question

The primary coil of a transformer has N turns and is connected to a 120 V a.c. power line. If the secondary coils has 1 000 turns and a terminal voltage of 1 200 volts, what is the value of N?

Options

A) 120

B) 100

C) 1 000

D) 1 200


The correct answer is B.

Explanation:

For the transformer, V ∝ ∩
=> V s ∝ ∩s; Vp ∝ ʌp
=> Vp/Vv = ∩p/∩s, therefore 120/1200 = ∩p/1000
therefore ∩p * 1200 = 120 * 1000
p = 120*1000/1200 = 100

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Dicussion (1)

  • For the transformer, V ∝ ∩
    => V s ∝ ∩s; Vp ∝ ʌp
    => Vp/Vv = ∩p/∩s, therefore 120/1200 = ∩p/1000
    therefore ∩p * 1200 = 120 * 1000
    p = 120*1000/1200 = 100

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