Question

27. The resistance of a tungsten wire is 1000 2 at 0°C and 1045 12 at 10°C. Calculate the
temperature coefficient of resistance of tungsten.
A) 0.0045/°C
B) 0.1045/°C
C) 0.0010/°C
D) 0.004/°C
​

Answer 1

Answer:

B) 0.1045/°

Explanation:

R

t

=

1+∝t

1+∝t

R

t

133

=

1+0.0045(500)

1+0.0045(150)

R

t

133

=

1+2.25

1+0.675

R

t

133

=

3.25

1.67

R

t

=

1.67

3.25×133

=

1.67

432.25

=258.8Ω