Advertisements
Advertisements
प्रश्न
A transformer lowers e.m.f. 220 V to 12 volts. If the number of turns in primary are 8800, how many turns are in secondary coil?
Advertisements
उत्तर
Using `"E"_"p"/"E"_"s" = "N"_"p"/"N"_"s"`
∴ `"200 V"/"12 V" = 8800/"N"_"s"`
∴ `"N"_"s" = (8800 xx 12)/220 = 40 xx 12 = 480`
∴ Number of turns in secondary coil = 480.
APPEARS IN
संबंधित प्रश्न
What type of current is transmitted from the power station?
Complete the following sentence :
……… energy is converted into …………energy by an electric motor.
Explain why an induced current must flow in such a direction so as to oppose the change producing it.
Describe briefly, with the help of labelled diagram, working of a step-up transformer.
A step-up transformer converts a low voltage into high voltage. Does it not violate the principle of conservation of energy? Explain.
Name the principle on which functioning of a transformer depends.
Describe the construction and working of a transformer with a neat labelled diagram.
A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the ratio of output to input power is 0.8, then the current drawn by primary winding is ______.
For an ideal step-down transformer, the quantity which is constant for both the coils is ______.
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.
The number of turns in the primary and secondary coils of an ideal transformer is 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 Ω.
Power in primary coil is ______.
The magnetic flux through a coil perpendicular to its plane is varying according to the relation Φ = (5t3 + 4t2 + 2t - 5) Weber. If the resistant of the coil is 5 ohm, then the induced current through the coil at t = 2 sec will be ______.
