The 400-turn primary coil of a step-down transformer is connected to an ac line that is 120 V rms. The secondary coil voltage is 6.50 V rms. Calculate the number of turns in the secondary coil.

Explanation:

The given data is as follows.

              = 120 V,     = 6.50 V

              = 400,     = ?

Formula to calculate the number of turns in secondary coil are as follows.

Putting the given values into the above formula as follows.

              = 21.66

                          = 22 (approx)

Thus, we can conclude that number of turns in the secondary coil are 22.

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