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प्रश्न
The primary coil of a transformer has 60 turns whereas its secondary coil has 3000 turns.
If a 220 V ac voltage is applied to the primary coil, how much emf is induced in the secondary coil?
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उत्तर
The voltage of primary coils is
VP = 220 V
Let the voltage of secondary coil be VS.
Now `"N"_"s"/"N"_"P" = "V"_"S"/"V"_"P"`
⇒ `3000/60 = "V"_"S"/220`
⇒ VS = 50 × 220
= 11,000 volt
VS = 11,000 V
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संबंधित प्रश्न
A group of students while coming from the school noticed a box marked "Danger H.T. 2200 V" at a substation in the main street. They did not understand the utility of a such a high voltage, while they argued, the supply was only 220 V. They asked their teacher this question the next day. The teacher thought it to be an important question and therefore explained to the whole class.
Answer the following questions:
(i) What device is used to bring the high voltage down to low voltage of a.c. current and what is the principle of its working ?
(ii) Is it possible to use this device for bringing down the high dc voltage to the low voltage? Explain
(iii) Write the values displayed by the students and the teacher.
Derive an expression for e.m.f. and current in terms of turns ratio
Find the ratio of primary and secondary currents in terms of turn ratio in an ideal transformer.
On which type of current do transformers work?
Mention the two characteristic properties of the material suitable for making core of a transformer.
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.
Draw the effective equivalent circuit of the circuit shown in figure, at very high frequencies and find the effective impedance.
The primary coil having NP turns of an ideal transformer is supplied with an alternating voltage VP. Obtain an expression for the voltage VS induced in its secondary coil having NS turns.
The self-inductance of a closely wound coil of 200 turns is 10 mH. Determine the value of magnetic flux through the cross-section of the coil when the current passing through the coil is 4 mA.
In an ideal transformer, the turns ratio is \[\frac {N_p}{N_s}\] = \[\frac {1}{2}\]. The ratio Vs : Vp is equal to (the symbols carry their usual meaning) ______.
