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A bulb is marked 220 V and 40 W. Calcula...

A bulb is marked 220 V and 40 W. Calculate the current flowing through the bulb and its resistance.

Text Solution

Verified by Experts

Given : Voltage = V = 220 V, Power = P = 40 W.
`P=VIrArrI=P/V=40/220=0.182A`
Resistance = `R=V/I=220/0.182=1210Omega`
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ZEN PUBLICATION-ELECTRICITY-ZEN ADDITIONAL QUESTIONS SECTION (SHORT ANSWER TYPE 1 QUESTIONS)
  1. What is nichrome? State its one use.

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  2. Which has more resistance: a] A long piece of nichrome wire or a sho...

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  3. What is the meaning of the symbol kWh? Which quantity does it represen...

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  4. Calculate the amount of charge flowing in a wire if it draws a current...

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  5. What happens to resistance of a conductor if area of cross section is ...

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  6. Why closed path is required for the flow of current?

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  7. Draw the V-I graph for ohmic and non-ohmic conductors.

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  8. A wire of resistivity p is pulled to double its length. What will be i...

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  9. List in a tabular form two differences between a voltmeter and an amme...

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  10. A given length of a wire is doubled on itself and this process is repe...

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  11. What is the need of using combination of resistance in electrical circ...

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  12. What is heating effect of current? Mention any two of its applications...

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  13. Define the term electric power. Write an expression for it.

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  14. Draw the diagram of an electric circuit in which the resistors R(1),R(...

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  15. An electric refrigerator rated 400 W is used for 8 hours a day. An ele...

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  16. A bulb is marked 220 V and 40 W. Calculate the current flowing through...

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  17. What are the advantages of connecting electrical devices in parallel w...

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  18. According to Joule's iaw of heating, mention the factors on which heat...

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  19. The resistivity of manganese wire of length 1 m is 1.84xx10^-6Omegam" ...

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  20. Observe the given circuit: Calculate the total resistance in the ...

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