| Direction: Q.46 to Q.50 |
| A transformer is essentially an AC device. It cannot work on DC. It changes alternating voltages or currents. It does not affect the frequency of AC. It is 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 \[0.6\text{ }\Omega \]. |
| Based on the above information, answer the following questions. |
A) 5 V
B) 2 V
C) 3 V
D) 10 V
Correct Answer: C
Solution :
(c) 3 V As \[\frac{{{E}_{S}}}{{{E}_{P}}}=\frac{{{n}_{S}}}{{{n}_{P}}}\Rightarrow {{E}_{S}}={{E}_{P}}\cdot \frac{{{n}_{S}}}{{{n}_{P}}}\] \[=\frac{120\times 50}{2000}=3\,V\]
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