Resistance of a tungsten wire at 150°C is 1332Ω. Its resistance temperature coefficient is 0.0045°C. The resistance of this wire at 500°C will be:
Correct answer: C. 258 Ω
- A. 180 Ω
- B. 225 Ω
- C. 258 Ω
- D. 317 Ω
Explanation
Using the resistance-temperature relationship R₂ = R₁[1 + α(T₂ - T₁)], we get R500= 133Ω[1 + 0.0045(500 - 150)]. This calculation yields a resistance of approximately 258 Ω.
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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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