मराठी

Draw a Labeled Diagram of a Step-down Transformer. - Physics

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प्रश्न

Draw a labeled diagram of a step-down transformer.

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उत्तर

Step-down transformer

 

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2015-2016 (March) All India Set 2 C

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संबंधित प्रश्‍न

A transformer converts 240 V AC to 60 V AC. The secondary has 75 turns. The number of turns in primary are _______.

(A) 600

(B) 500

(C) 400

(D) 300

 


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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.

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 ______.


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  1. zero average current.
  2. 220 V average voltage.
  3. voltage and current out of phase by 90°.
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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 ______.


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