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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
Why is the core of a transformer laminated?
Name the phenomenon ?
How are the e.m.f in the primary and secondary coils of a transformer related with the number of turns in these coils?
What is the turns ratio i.e., transformer ratio, ns: np, in an ideal transformer which in-creases ac voltage from 220 V to 33000 V?
Name the principle on which functioning of a transformer depends.
A transformer lowers e.m.f. from 220 V to 15 V. If 400 W power is given in primary, calculate (i) the current in primary coil and (ii) the current in secondary coil.
A step-down transformer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is
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`.
An ideal transformer converts 170 V a.c. to 1.70 KV a.c. to transmit a power of 3.4 KW. If primary coil has 500 turns then alternating current in secondary coil is ______.
