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An electric iron of resistance 20Omega t...

An electric iron of resistance `20Omega` takes a current of 5 A. Calculate the heat developed in 30 sec.

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`H=I^(2)Rt=52xx20xx30=15000JH=15kJ`
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ZEN PUBLICATION-ELECTRICITY-ZEN ADDITIONAL QUESTIONS SECTION (MULTIPLE CHOICE QUESTIONS)
  1. An electric iron of resistance 20Omega takes a current of 5 A. Calcula...

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  2. A cell, a resistor, a key and ammeter are arranged as shown in the cir...

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  3. Electrical resistivity of a given metallic wire depends upon

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  4. What is the maximum resistance which can be made using five resistors ...

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  5. What is the minimum resistance which can be made using five resistors ...

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  6. Which of the following represents voltage?

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  7. Unit of electric power may also be expressed as

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  8. Which of the following statements does not represent Ohm's law?

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  9. Two resistances of 100 Ω and zero ohm are connected in parallel. Th...

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  10. Three resistors 2 Ω, 3Ω and 4Ω are connected so that the equivalent re...

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  11. When a current 'l' flows through a resistance 'R' for time 't' the ele...

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  12. When a fuse is rated 8 A, it means

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  13. The work done in moving a unit positive charge across two points in an...

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  14. The potential at a point is 20 V. The work done to bring a charge of 0...

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  15. The free electrons of a metal

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  16. The path of a free electron in a metal is

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  17. When there is an electric current passing through a wire, the particle...

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  18. A positive charge released from rest

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  19. Three equal resistances when combined in series are equivalent to 90Ω....

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  20. For which of the following substances, resistance decreases with incre...

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  21. Two electric bulbs have resistances in the ratio 1 : 2. If they are jo...

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