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##### 13.3 A current of 6 \mathrm{~A} is drawn from a 120 \mathrm{~V} line. What power is being developed? How much energy in joule and in Kwt is expended if the current is drawn steadlly for one week

Example: 13.6 What would be the resistance of the above bar at 500^{\circ} \mathrm{C} ?

13.7 Describe a circuit which will give a continuously var ying potential.

14.11. A resistor of resistance 5.6 \Omega is connected across a battery of 3.0 \mathrm{~V} by means of a wire of negligible resistance. A current of 0.5 A passes through the resistor.Calculate(a) Power dissipated in the resistor.(b) Total power produced by the battery.(c) Give the reason of difference between these two quantities.Ans. [(a) 1.4W(b) 1.5 \mathrm{~W} (c) some power is lost by the internal resistance of the battery]

13.10 Ten resistances of different value are connected in parallel. If the p.d.across one of them is 5 \mathrm{~V} . what is the p.d. across the remalning nine resistors?

14.4. By applying a potential difference of 10 \mathrm{~V} across a conductor a current of 1.5 A passes through it. How much energy would be obtained from the current in 2 minutes?Ans. (1800 J)

13.6 When a metal object is heated. both its dimensions and fts resistlvity increase. Is the increase in resistivity likely to be a consequence of the increase in length?