Question

The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.

Answer 1

Given data:

R₀ = 10Ω

The boiling point of water T = 100°C

α = 0.004°C

R_T = ?

Formula:

R_T = R₀ [l + αT)]

R_T = 10 [1 + (0.004 × 100)]

= 10(1 + 0.4)

= 10 (1.4)

R_T = 14Ω

As the temperature increase the resistance of the wire also increases.