Transformation 26951

The bell uses 8 V alternating voltage obtained from the 220 V mains. The secondary coil of the bell transformer has 60 turns. How many turns must the primary coil have? What is the transformation ratio?

Correct answer:

n1 =  1650
k =  0.0364

Step-by-step explanation:

u2=8 V u1=220 V n2=60 V  k = u1u2 = n1n2  k=u1u2=2208=5520.0364  n1=n2/k=60/552=60:552=60 255=260 55=23300=1650

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