Advertisements
Advertisements
प्रश्न
The input and output voltages of a transformer are 220 V and 44V respectively. Find the current in input circuit if the output current is 2 A.
उत्तर
Output current Is = 2A, Es =44V.
Input current Ip = ?, Ep =220 V.
We know that =Es Is = EpIp
Ip = `(44 xx 2 "A")/220`
= 0.4 A
APPEARS IN
संबंधित प्रश्न
How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of the coil in them?
An a.c generator generates an emf 'ε' where ε = 314 Sin (50πt) volt. Calculate the frequency of emf ε.
An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the AC is 28 V. The rms secondary voltage is nearest to ______
State the mathematical relation between a number of turns in the primary coil to a secondary coil in the step-up transformer.
What is Transformer?
Devices which is used to convert high alternating current to low alternating current is ______.
State whether true or false. If false, correct the statement.
A transformer can step up direct current.
Find out the phase relationship between voltage and current in a pure inductive circuit.
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.
The value of voltage across the secondary coil is ______.
Explain why core of a transformer is always laminated.
