Current Electricity 3 Question 9

8. The three resistances of equal value are arranged in the different combinations shown below. Arrange them in increasing order of power dissipation

(2003,2M)

(a) III < II < IV < I

(b) II < III < IV < I

(c) I < IV < III < II

(d) I < III < II < IV

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Solution:

  1. P=i2R

Current is same, so PR.

In the first case it is 3r, in second case it is 23r, in third case it is r3 and in fourth case the net resistance is 3r2.

RIII <RII <RIV <RIIPIII <PII <PIV <PI



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