Question

(i) Write the function of a transformer. State its principle of working with the help of a diagram. Mention various energy losses in this device. 

(ii) The primary coil of an ideal step up transformer has 100 turns and transformation ratio is also 100. The input voltage and power are respectively 220 V and 1100 W. Calculate 

(a) number of turns in secondary 

(b) current in Primary

(c) voltage across secondary

(d) current secondary

(e) power in secondary

Answer 1

(i) Conversion of ac of low voltage into ac of high voltage & vice versa.

Mutual induction : When alternating voltage is applied to primary windings, emf is induced in the secondary windings.

Energy losses :

(a) Leakage of magnetic flux

(b) Eddy currents

(c) Hysteresis loss

(d) Copper loss

(e) Power in secondary = Power in Primary

= 1100 W