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The electrical energy consumed by a 30 ...

The electrical energy consumed by a 30 W bulb in 5 minutes is _________ .

A

9000 kJ

B

9 Kj

C

9000 MJ

D

9 MJ

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The correct Answer is:
B
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Two bulbs each of 60 W and 80 W power are used for (1/4)th a day and (1/2) a day, respectively. Write the following steps in a sequential order to find the total number of units consumed by them when they are used for 30 days. (a) Now, multiply E with 30, to get the energy consumed by them in 30 days. (b) Find the electric energy consumed by each bulb in a day using E_(1)=P_(1)t_(1) and E_(2)=P_(2)t_(2) . (c) Note down the powers of the bulbs and the time for which they are used per day as P_(1), P_(2) and t_(1) , t_(2) , respectively. (d) Convert the time into hours. (e) Find the total energy (E) consumed by them in one day, i.e., E=E_(1)+E_(2) . (f) Write the energy in terms of units, i.e., commercial unit of electric energy.

Two electric bulbs of 100 W each is used for 10 hours in the month of June. Write the following steps in sequential order to find the numbe of units of electricity consumed in the month of June. (A) The number of units of electricity consumed by both bulbs in the month of June is the total elec-trical energy consumed by bulbs expressed in W h divided by 100 W h . (B) Note the rated power of each electric bulb, time of electrical consumption of each bulb per day from the given data. (C ) We know, one electrical unit = 1 kW h or 1000 W h . (D) Calculate the amount of electrical energy con-sumed by both the bulbs in the month of June using, (sum of the electrical power of both the bulb) xx (time of consumption in one day) xx 30 days.

Pranith recived an electric bill for the month of April. He started verifying it by calculating the electrical energy consumed by a 2000 W electrical appliance that is used for two hours every day in his workshop. In his house he used bulbs of 100 W for 4 hours every day in the month of april, which con-sumes the same electrical energy as that of the elec-trical appliance in the work shop. Find the number of bulbs Panith uses in his house.

Calculate the electrical energy consumed in units when a 60W bulb is used for 10 hours.

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PEARSON IIT JEE FOUNDATION-ELECTRICITY-Concept Application (Level 1)
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  2. During electrification by friction

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  3. The electrical energy consumed by a 30 W bulb in 5 minutes is .

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  4. SI unit of electric charge is :

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  5. The S.I. unit of surface charge density is .

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  6. If 2 A of current flows through a conductor, the charge that flows i...

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  7. When no charge is supplied to or removed from a neutral body, then the...

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  8. Two wires of same material and length have the radii of their cross ...

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  9. Which among the following has carbon as the positive electrode?

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  10. The charge supplied to a good conductor always resides

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  11. The process suitable for charging a glass rod is

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  12. The bluish white streak of light seen during lightning is due to

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  13. During lightning, thunder is produced due to

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  14. In which of the following cells, carbon is not used as positive electr...

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  15. Which is false about electrolysis ?

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  16. In a circuit, a battery can be represented by

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  17. An electric current of 6 A flows through a circuit for 10 minutes. W...

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  18. Two bulbs each of 60 W and 80 W power are used for (1/4)th a day and ...

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  19. Assertion (A) : All the bulbs connected in parallel glow brightly. R...

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  20. Assertion (A): A 200 W bulb consumes 2 units of electrical energy whe...

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