What happens to resistance when temperature is held constant?

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Multiple Choice

What happens to resistance when temperature is held constant?

Explanation:
When temperature is fixed, the material’s resistivity stays the same, and the resistance simply depends on ρ, the length, and the cross-sectional area: R = ρL/A. With those factors not changing, R remains constant. In an ohmic device, changing the voltage changes the current in proportion to this constant resistance (V = IR), but the resistance itself doesn’t vary as long as temperature stays the same. If temperature were allowed to change, heating could alter resistivity and thus R, but at a constant temperature the resistance stays constant.

When temperature is fixed, the material’s resistivity stays the same, and the resistance simply depends on ρ, the length, and the cross-sectional area: R = ρL/A. With those factors not changing, R remains constant. In an ohmic device, changing the voltage changes the current in proportion to this constant resistance (V = IR), but the resistance itself doesn’t vary as long as temperature stays the same. If temperature were allowed to change, heating could alter resistivity and thus R, but at a constant temperature the resistance stays constant.

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