Class 12 Physics
CBSE and UP Board
Alternating Current
Chapter-7 Exercise 7.23
Additional Exercise
NCERT Solutions for Class 12 Physics Chapter 7 Question 23
A power transmission line feeds input power at 2300 V to a stepdown transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?
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Input voltage, V1 = 2300 V
Number of turns in primary coil, n1 = 4000
Output voltage, V2 = 230 V
Number of turns in secondary coil = n2
Voltage is related to the number of turns as:
V1/V2=n1/n2
=> 2300/230 = 4000/n2
=> n2= 4000 x 230 /2300 = 400
Hence, there are 400 turns in the second winding.