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  • (a) State the principle of working of a transformer. (b) Define efficiency of a transformer. (c) State any two factors that reduce the efficiency of a transformer. (d) Calculate the current drawn by the primary of a <img a

(a) State the principle of working of a transformer.

(b) Define efficiency of a transformer.

(c) State any two factors that reduce the efficiency of a transformer.

(d) Calculate the current drawn by the primary of a 90^{o}/_{o} efficient transformer which steps down 220 V to 22 V, if the output resistance is440\; \Omega.

 

 

 
 
 
 
 

Answers (1)

(a) \rightarrow Transformer works on the principle of mutual induction.

\rightarrow whenever the current associated with the primary coil charges an emf is induced in the secondary coil.

   (b)

 Efficiency =\frac{output\; power}{input \; power}

(c) Eddy current loss and hysteresis loss reduces the efficiency of the transformer

(d) Efficiency

 \eta=\frac{V_{s}I_{s}}{V_{p}I_{p}}

 0.9=\frac{22}{220}\times \left ( \frac{I_{s}}{I_{p}} \right )

  \frac{I_{s}}{I_{p}}=9

 I_{p}=\frac{I_{s}}{9}=\frac{\frac{22}{440}}{9}  =\frac{1}{180}A

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Safeer PP

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