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What is the effect of temperature on the resistance of a metallic conductor?
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As temperature increases, the resistance of a metallic conductor generally increases.
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How does resistance change with temperature in semiconductors?
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In semiconductors, resistance decreases as temperature increases.
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What is the temperature coefficient of resistance?
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The temperature coefficient of resistance is a measure of how much a material's resistance changes with temperature.
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Why does the resistance of metals increase with temperature?
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Resistance in metals increases with temperature due to increased atomic vibrations, which cause more frequent scattering of electrons.
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How does superconductivity relate to temperature?
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Superconductivity occurs when a material's resistance drops to zero below a certain critical temperature.
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What is the formula for determining resistance change with temperature?
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ΔR = αR₀ΔT, where ΔR is the change in resistance, α is the temperature coefficient, R₀ is the original resistance, and ΔT is the change in temperature.
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In which type of material does resistance decrease as temperature increases?
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Resistance decreases with increasing temperature in semiconductors.
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What does a negative temperature coefficient indicate?
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A negative temperature coefficient indicates that resistance decreases with increasing temperature.
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How does resistance affect power losses in electrical systems?
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Increased resistance leads to higher power losses due to Joule heating (P = I²R).
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What is an example of a device that uses temperature-dependent resistance?
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Thermistors are devices that use temperature-dependent resistance to measure temperature changes.
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How does temperature affect the resistivity of materials?
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Temperature affects resistivity by increasing it in conductors and decreasing it in semiconductors.
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What is meant by critical temperature in superconductors?
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The critical temperature is the temperature below which a material becomes superconducting, having zero resistance.
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Can temperature-corrected resistance be used to measure temperature?
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Yes, changing resistance due to temperature can be calibrated to measure temperature in devices such as RTDs (Resistance Temperature Detectors).
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Why are ceramic materials often used in temperature sensors?
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Ceramic materials are used because they have predictable resistance changes with temperature and are stable over wide temperature ranges.
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What is PTC in relation to thermistors?
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PTC stands for Positive Temperature Coefficient, indicating resistance increases as temperature increases in these thermistors.
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