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noor.lalu
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1.What happens to the electrical resistance of conductors, semiconductors, with increase in temperature? And explain why?
thank u soo much now i clearly understandlionelwang said:For conductors, the resistance will increase with T, while for some semiconductors, the resistance may decrease with T, which results from the agitation of the electrons in the valence band
Electric resistance is the measure of a material's opposition to the flow of electric current. It is measured in ohms (Ω) and is dependent on the material's properties, such as its composition, temperature, and dimensions.
As the temperature of a conductor increases, its resistance also increases. This is because the temperature causes the atoms in the conductor to vibrate more, which hinders the flow of electrons and increases resistance. This relationship is described by the temperature coefficient of resistance, which varies for different materials.
Unlike conductors, the resistance of semiconductors decreases as temperature increases. This is because the increased temperature excites the electrons in the semiconductor, allowing them to move more freely and decreasing resistance. However, at very high temperatures, this trend can reverse and the resistance may increase again.
The main difference between conductors and semiconductors is that conductors have a positive temperature coefficient of resistance, while semiconductors have a negative temperature coefficient of resistance. This means that the resistance of conductors increases with temperature, while the resistance of semiconductors decreases with temperature.
The temperature coefficient of resistance is an important factor to consider in the design and use of electronic devices. It allows engineers to predict how a material's resistance will change with temperature, and therefore design circuits and systems that can compensate for these changes. It is also used in the calibration of temperature sensors and in the construction of precision resistors.