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An electric refrigerator rated 400 W ope...

An electric refrigerator rated 400 W operates 8 hour/day. What is the cost of the energy to operate it for 30 days at Rs 3.00 per kW h?

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The total energy consumed by the refrigerator in 30 days would be 400 W `xx` 8.0 hour/day `xx` 30 days = 96000 W h
= 96 kW h
Thus the cost of energy to operate the refrigerator for 30 days is
96 kW h `xx` Rs 3.00 per kW h = Rs 288.00
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NCERT TELUGU-ELECTRICITY-EXERCISES
  1. An electric refrigerator rated 400 W operates 8 hour/day. What is the ...

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  2. A piece of wire of resistance R is cut into five equal parts. These pa...

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  3. Which of the following terms does not represent electrical power in a ...

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  4. An electric bulb is rated 220 V and 100 W. When it is operated on 110 ...

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  5. Two conducting wires of the same material and of equal lengths and equ...

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  6. How is a voltmeter connected in the circuit to measure the potential d...

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  7. A copper wire has diameter 0.5 mm and resistivity of 1.6 xx 10^(–8) O...

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  8. The values of current I flowing in a given resistor for the correspond...

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  9. When a 12 V battery is connected across an unknown resistor, there is ...

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  10. A battery of 9 V is connected in series with resistors of 0.2 Omega, 0...

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  11. How many 176 Omega resistors (in parallel) are required to carry 5 A o...

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  12. Show how you would connect three resistors, each of resistance 6 Omega...

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  13. Several electric bulbs designed to be used on a 220 V electric supply ...

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  14. A hot plate of an electric oven connected to a 220 V line has two resi...

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  15. Compare the power used in the 2 Omega resistor in each of the followi...

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  16. Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are ...

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  17. Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in...

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  18. An electric heater of resistance 8 Omega draws 15 A from the service ...

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  19. Explain the following. (a) Why is the tungsten used almost exclusivel...

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