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प्रश्न
In a transformer, the frequency of A.C. voltage ______.
विकल्प
increase
decreases
remains same
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उत्तर
In a transformer, the frequency of A.C. voltage remain same.
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संबंधित प्रश्न
Which coil of a step up transformer is made thicker and why?
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Can a transformer be used with direct current source? Give reason.
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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 is based on the phenomenon of mutual induction. A transformer essentially consists of two coils of insulated copper wire having different numbers of turns and wound on the same soft iron core.
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The line that draws power supply to your house from street has ______.
- zero average current.
- 220 V average voltage.
- voltage and current out of phase by 90°.
- voltage and current possibly differing in phase `phi` such that `|phi| < pi/2`.
Magnetic flux passing through a coil is initially 4 × 10-4 Wb. It reduces to 10% of its original value in t second. If the emf induced is 0. 72 mV then t in second is ______.
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