A step-up transformer has a turn ratio of 1 : 100. An alternating supply of 20 V is 15 .5 connected across the primary coil. What is the secondary voltage? Ans. (2000 V)



Data Given:


A step-up transformer has a turn ratios = Np : Ns = 1 : 100

i.e    `\frac{Np}{Ns}` = `\frac{1}{100}`

or

`\frac{Ns}{Np}` = `\frac{100}{1}`


Supplied Voltage to the primary coil of transformer  = Vp = 20 V


To Find:


Output Voltage of the secondary coil of transformer  = Vs = ?


Solution:


The relationship between voltages and the number of turns of Primary and secondary coils are as follows

`\frac{Ns}{Np}` = `\frac{Vs}{Vp}`

by reversing (flipping) the fraction 

Vs = `\frac{Ns}{Np}` ｘ Vp

by putting values

Vs = `\frac{100}{1}` ｘ 20 V

Vs = 2000 V -----------Ans.
Thus, the output voltage of the secondary coil is 2000 volts

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