A filament lamp behaves like an Ohmic conductor when its temperature
Correct answer: D. Remains constant.
- A. Increases.
- B. Decreases.
- C. Becomes 0⁰C.
- D. Remains constant.
Explanation
A filament lamp behaves like an Ohmic conductor when its resistance remains constant, which occurs when its temperature remains constant. Ohmic conductors follow Ohm's Law, where the current through a conductor between two points is directly proportional to the voltage across the two points. For a filament lamp, if the temperature increases, the resistance increases, and it does not exhibit Ohmic behavior. Therefore, the correct answer is that a filament lamp behaves like an Ohmic conductor when its temperature remains constant. The other options are incorrect because changes in temperature affect the resistance, thus deviating from Ohmic behavior.
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About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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