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प्रश्न
State whether true or false. If false, correct the statement.
A transformer can step up direct current.
पर्याय
True
False
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उत्तर
False
Correct Statement: A transformer can step up alternating current.
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संबंधित प्रश्न
Find the ratio of primary and secondary currents in terms of turn ratio in an ideal transformer.
The adjacent diagram shows a coil would around a soft iron bar XY. (a) State the polarity at the end X and Y as the switch is pressed. (b) Suggest one way increasing the strength of electromagnet so formed.
State two ways through which the strength of an electromagnet can be increased.
Explain the significance of Lenz’s law to show the conservation of energy in electromagnetic induction.
The following diagram in Fig.10.42 shows a coil of several turns of copper wire connected to a sensitive centre zero galvanometer G near a magnet NS. The coil is free to move in the direction shown in the diagram.
(i) Describe the observation if the coil is rapidly moved.
(ii) How would the observation be altered if (a) the coil has twice as many turns (b the coil was made to move three times as fast?
What is the function of a step-up transformer?
Transformer works on ______.
Efficiency of transformer is the ratio of ______.
A 12 V, 60 W lamp is connected to 220 V AC via an ideal transformer. Find the primary current.
