Q.

A heating element using nichrome connected to a 230V supply draws an initial current of 3.2A which settles after a few seconds to a steady value of 2.8A. What is the steady temperature of the heating element if the room temperature is 27.0°C ? Temperature coefficient of resistivity of nichrome averaged over the temperature range involved is 1.70×104/C0 ?

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a

840°C

b

871°C

c

1040°C

d

1067°C

answer is B.

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Detailed Solution

detailed_solution_thumbnail

v=iR=i'R'

3.2 R01+27α=2.8 R01+αt

81+27α=71+αt

1=α7t-216 1041.7=7t-216 t8720C

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