If the temperature of a resistance wire is gradually increased, its resistance will
decrease gradually
first increase and then decrease
first increase and then remain the same
increase gradually
remain the same
Explanation
Video Explanation
No video available
Post your Contribution
Discussions (4)
The correct answer is:
D. Increase gradually
Explanation:
For a metallic resistance wire, as temperature increases, the resistance also increases gradually. This happens because:
Higher temperatures cause more vigorous vibrations of metal atoms, which increase collisions with free electrons.
Increased collisions hinder electron flow, increasing resistance.
This behavior is described by the formula:
š
š
=
š
0
(
1
+
š¼
š
)
R
T
ā
=R
0
ā
(1+Ī±T)
where:
š
š
R
T
ā
= Resistance at temperature
š
T
š
0
R
0
ā
= Resistance at reference temperature
š¼
Ī± = Temperature coefficient of resistance (positive for metals)
š
T = Change in temperature
Since most metals have a positive temperature coefficient of resistance, their resistance increases with temperature.
The answer should "D - resistance increase gradually"
As the temperature of a metallic wire increases, its resistance generally increases as well, but it doesn't stop increasing at a specific point except the temperature stop increasing. The resistance will continue to increase with temperature, though the rate of increase may change.
