Question:
A step up transformer operates on a $230V$ line and a load current of $2A$. The ratio of the primary and secondary windings is $1\,:\, 25$. The current in the primary is
A step up transformer operates on a $230V$ line and a load current of $2A$. The ratio of the primary and secondary windings is $1\,:\, 25$. The current in the primary is
Updated On: Jul 6, 2022
- 25 A
- 50 A
- 15 A
- 12.5 A
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The Correct Option is B
Solution and Explanation
For a transformer , $\frac{I_p}{I_s} = \frac{N_s}{N_p} \, i.e. \, I_p = \frac{N_s}{N_p} \times I_p = \frac{25}{1} \times 2 $ = 50 A
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Concepts Used:
Electromagnetic Induction
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
- When we place the conductor in a changing magnetic field.
- When the conductor constantly moves in a stationary field.
Formula:
The electromagnetic induction is mathematically represented as:-
e=N × d∅.dt
Where
- e = induced voltage
- N = number of turns in the coil
- Φ = Magnetic flux (This is the amount of magnetic field present on the surface)
- t = time
Applications of Electromagnetic Induction
- Electromagnetic induction in AC generator
- Electrical Transformers
- Magnetic Flow Meter