Question

what is the resistance of filament at 3000 degree celcius?​

Answer 1

Explanation:

R

100

=100Ω ,T

1

=100

o

C ,R

′

=200Ω , α=0.005 per

o

C

Step 1: Relation between resistance and temperature

R=R

0

(1+α(T

2

−T

1

))

where α is the temperature coefficient of resistance.

So, R

′

=R

100

(1+α(T

2

−T

1

)) ....(1)

Step-2: Final temperature

Putting values of R

100

,T

1

,R

′

,α in equation (1), we get

200=100(1+0.005(T

2

−100))

Or, T

2

−100=200

⇒ T

2

=300

o

C