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प्रश्न
Name the principle on which functioning of a transformer depends.
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उत्तर
The functioning of a transformer depends on the phenomenon of electromagnetic induction.
संबंधित प्रश्न
The following diagram in Fig. 10.44 shows a coil X connected to a sensitive centre –zero galvanometer G and a coil P connected to a battery through a switch S.
(a) Describe the observation when the switch S is (i) closed suddenly, (ii) then kept closed, (iii) finally opened.
(b) Name and state the law which explains the above observations.
In an ideal transformer, an output of 66 kV is required when an input voltage of 220 V is available. If the primary has 300 turns, how many turns should the secondary have?
State the mathematical relation between a number of turns in the primary coil to a secondary coil in the step-up transformer.
Distinguish between Step up and Step Down Transformer.
Transformer works on ______.
Find out the phase relationship between voltage and current in a pure inductive circuit.
Read the following paragraph and answer the question:
Long distance power transmissions
The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped up. It is then transmitted over long distances to an area sub-station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes.
If the secondary coil has a greater number of turns than the primary, ______.
The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an a.c supply of 120 V and the current flowing in its is 10 A. The voltage and the current in the secondary are ______.
Efficiency of transformer is the ratio of ______.
What is a transformer?
