In the given diagram C2 has 1/5 coil of C1. If the input voltage is 1200V, what will be the output voltage? What is the reason behind laminating the core of this device?

Solution

Input voltage, V₁ = 1200v.

Let

Number of turns in secondary coil C2 = N₂ 

Number of turns in secondary coil C1 = N₁

Output voltage = V₂.

From question,

      1
N₂ =     N₁
      5

  N₂       1
      =      
  N₁       5

 From the transformer ratio, we have

  N₂       V₂
      =      
  N₁       V₁

       V₂       1
Or,        =      
       V₁       5

         V₂         1
Or,            =      
       1200 V       5

            1      240 V
Or, V₂ =       1200 V
            5 

∴ V₂ = 240 V.

 Hence the output voltage will be 240 V. 
Laminated core dissipates less amount of heat than a single block of iron core would. Hence laminated core reduces core loss in transformer and increases transformer efficiency. That is why, core of transformer is laminated.