For a metallic wire, the ratio V/I (V = applied potential difference, I = current flowing):
Correct answer: D. Increases as the temperature rises
- A. Increases or decreases as the temperature rises, depending upon the metal
- B. Decreases as the temperature rises
- C. Independent of temperature
- D. Increases as the temperature rises
Explanation
V/T = R and for metals R ↑, on ↑ in the temperature.
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Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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