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A stepdown transformer is used to change...

A stepdown transformer is used to change

A

high voltage d.c. into low voltage d.c.

B

high voltage a.c. into low voltage a.c.

C

mechanical energy into electrical energy

D

electrical energy into mechanical energy.

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MODERN PUBLICATION-TEXTUAL QUESTIONS-EXERCISE
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  10. The thermistors are usually made of

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  11. The resistance of a bulb filmanet is 100Omega at a temperature of 100^...

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  13. The resistance of hot tungsten filament is about 10 times the cold res...

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  14. An electric bulb is rated 220 V and 100 W. when it is operated on 110 ...

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  15. An 220 volt-1000 watt bulb is connected across a 110 volt mains supply...

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  17. If in the circuit, power dissipation is 150 W, then R is

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  18. A wire when connected to 220 V mains supply has power dissipation P1. ...

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  19. The resistance of the series combination of two resistances is S. WHen...

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