Q9 of 50 Page 380

You are given a resistance wire of length 50 cm and a battery of negligible resistance. In which of the following cases is the largest amount of heat generated:

Heat generated in an element is given by


For largest amount of heat generation, R must be smallest and R is smallest in parallel connection.

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7

A house is fitted with 5 tubes each f 40 W. If all the tubes are lighted for 20 hours and if the cost of electrical unit is Rs. 0.50, the total cost of electricity consumed is:

 8

Of the two bulbs in a house, one glows brighter than the other. Which of the two has a larger resistance?

 10

You are given three bulbs of 25 W, 40 W and 60 W marked at 220 V. Which one of them has lowest resistance?

 11

The potential difference across a conductor is doubled, the rate of generation of heat will: