| Directions : (21-25) |
| Case Study-5 |
| A transformer is essentially an a.c. device. It cannot work on d.c. It changes alternating voltages or currents. |
| It does not affect the frequency of a.c. It based on the phenomenon of mutual induction. A transformer essentially consists of two coils of insulated copper wire having different number of turns and wound on the same soft iron core. |
| The number of turns in the primary and secondary coils of an ideal transformer are 2000 and 50 respectively. |
| The primary coil is connected to a main supply of 120 V and secondary coil is connected to a bulb of resistance \[0\centerdot 6\Omega \]. |
A) 5V
B) 2 V
C) 3V
D) 10 V
Correct Answer: C
Solution :
As \[\frac{{{E}_{s}}}{{{E}_{p}}}=\frac{{{n}_{s}}}{{{n}_{p}}}\] \[\Rightarrow \,{{E}_{s}}={{E}_{p}}.\frac{{{n}_{s}}}{{{n}_{p}}}=\frac{120\times 50}{2000}=3\,V\]
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