Question 385: Current Electricity

Question

A heating element has a resistance of 100 $\Omega $ at room temperature.  When it is connected to a supply of 220 V, a steady current of 2 A passes in it and temperature is 500
o
C more than room temperature. what is the temperature coefficient of resistance of the heating element ?

Accepted Answer

When temperature increased by 500
o
C then, nrw registance
R
t
= ${{220} \over 2}$ = 110 $\Omega $
We know,
R
t
= R
0
(1 + $ \propto $ $\Delta $ t)
$ \Rightarrow $ 110 = 100 (1 + $ \propto $ $ 	imes $ 500)
$ \Rightarrow $ $ \propto $ = ${{10} \over {100 	imes 500}} = 2 	imes {10^{ - 4}}$
o
C
$-$1

Answer

0.5 $ 	imes $ 10
$-$4
o
C
$-$1

Answer

5 $ 	imes $ 10
$-$4
o
C
$-$1

Answer

1 $ 	imes $ 10
$-$4
o
C
$-$1

Answer

2 $ 	imes $ 10
$-$4
o
C
$-$1

Current Electricity

A heating element has a resistance of 100 \Omega at room temperature. When it is connected to a supply of 220 V, a steady current of 2 A passes in it and temperature is 500 o C more than room temperature. what is the temperature coefficient of resistance of the heating element ?

Choose the correct answer: