Question 310: 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 500oC 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 oC$$-$$1

Answer

5 $$ 	imes $$ 10$$-$$4 oC$$-$$1

Answer

1 $$ 	imes $$ 10$$-$$4 oC$$-$$1

Answer

2 $$ 	imes $$ 10$$-$$4 oC$$-$$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 500oC more than room temperature. what is the temperature coefficient of resistance of the heating element ?

Choose the correct answer: