Question: Q. 13. The temperature coefficient of resistivity, for two materials A and B, are 0.0031/C and 0.0068/C respectively.

Two resistors R1 and R2, made from materials A and B, respectively, have resistances of 200Ω and 100Ω at 0C. Show on a diagram, the ‘colour code’, of a carbon resistor, that would have a resistance equal to the series combination of R1 and R2 at a temperature of 100C. (Neglect the ring corresponding to the tolerance of the carbon resistor).

A [Foreign Comptt. 2016]

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Solution:

Ans.

Rt=R0(1+αΔt)

For Resistance R1

R1=R1(1+αΔt) =200(1+0.0031×100) =262Ω

For Resistance R2

R2=100(1+0.0068×100) =168Ω

Hence, Total Resistance in series combination of R1 and R2 at 100C :

R=R1+R2=262+168

430Ω

1/2

orange

[CBSE Marking Scheme 2016]



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