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Question

The units of the temperature coefficient of resistance are :
$Ω K^{- 1}$
$Ω K$
$K^{- 1}$
$(Ω K)^{- 1}$

A

K^{- 1}

B

Ω K^{- 1}

C

(Ω K)^{- 1}

D

Ω K

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Solution

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The ratio of increase in resistance per degree rise in temperature to its resistance at $0^{0} C$ is defined as the temperature coefficient of resistance( $α$ ).
$α = \frac{R_{t} - R_{0}}{R_{0} t}$ .
The unit of $α$ is $K^{- 1}$ .

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