A filament lamp behaves like an Ohmic conductor when its temperature
Correct answer: A. increases.
- A. increases.
- B. decreases.
- C. becomes 0oC.
- D. remains constant.
Explanation
When a filament lamp behaves like an Ohmic conductor, its resistance increases with temperature. This is because the increased temperature causes the atoms in the filament to vibrate more, impeding the flow of electrons and increasing resistance. The correct answer is 'increases.' The other options are incorrect because they do not align with the expected behavior of an Ohmic conductor in relation to temperature.
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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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