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Ohm's law describes a metal conductor only while which quantity is held constant?
AThe wire colour
BThe wire mass
CThe room size
DThe temperature
Answer & Solution
Correct answer: D. The temperature
1. Ohm's law relates the current through a conductor to the voltage across it.
2. The relationship holds for a metal conductor at a constant temperature.
3. Resistance changes with temperature in almost every metal, so temperature must be pinned down.
4. Only then does a graph of current against voltage come out as a straight line.
_Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 11: Electric circuits_
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