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Question 21: (a) Derive the expression for the heat produced due to a current ‘I’ flowing for a time interval ‘t’ through a resistor ‘R’ having a potential difference ‘V’ across its ends. With which name is this relation known ? (b) How much heat will an instrument of 12 W produce in one minute if it is connected to a battery of 12 V ? (c) The current passing through a room heater has been halved. What will happen to the heat produced by it ? (d) What is meant by the heating effect of current ? Give two applications of the heating effect of current. (e) Name the material which is used for making the filaments of an electric bulb. Lakhmir Singh Physics Class 10 |
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Answer» done w = potential difference V × CHARGE q .....3by ohm's LAW , V = IR .....1q =It ......2substitute 1,2 in 3w= V × qw= IR × Itw= L2 ( I square) Rt ACCORDING to joules law ,W= H,I 2 (i square) Rt |
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