2. Of what material is a resistor made if its resistance is 40.0% greater at 100ºC than at 20.0ºC? Its resistance to the flow of current is similar to the resistance posed by a pipe to fluid flow. 6. Note that α is positive for metals, meaning their resistivity increases with temperature. Figure 5. It is sometimes called Specific Resistance. Integrated Concepts (a) Redo Exercise 2 taking into account the thermal expansion of the tungsten filament. Sheet resistance is the resistance of a thin sheet of material which when multiplied by the thickness (in cm) gives the value of resistivity. Use the thermal coefficient of resistivity to calculate the change of resistance with temperature. Numerous thermometers are based on the effect of temperature on resistance. You may assume a thermal expansion coefficient of 12 × 10−6/ºC. Temperature affects resistivity; for relatively small temperature changes, Values depend strongly on amounts and types of impurities. The diameter is just under a tenth of a millimeter. The resistance R of a uniform cylinder of length L, of cross-sectional area A, and made of a material with resistivity ρ, is. One example is spreading resistance profiling, where the material is inhomogeneous (different resistivity in different places), and the exact paths of current flow are not obvious. The area of a circle is related to its diameter D by. (See Figure 3.) A copper wire has a resistance of 0.500 Ω at 20.0ºC, and an iron wire has a resistance of 0.525 Ω at the same temperature. The resistivity of all materials depends on temperature. In which of the three semiconducting materials listed in Table 1 do impurities supply free charges? R = p X l/A, Or, Resistance = Resistivity X length/area Here, R is the resistance, p is the resistivity, l is the length and A is the area of cross section of the conductor through which current flows.

(b) What is its resistance at 150ºC? where ρ0 is the original resistivity and α is the temperature coefficient of resistivity. Whether or not a material obeys Ohm's law, its resistance can be described in terms of its bulk resistivity.

A wire is drawn through a die, stretching it to four times its original length. The materials listed in the table are separated into categories of conductors, semiconductors, and insulators, based on broad groupings of resistivities. 9.

If aluminum and copper wires of the same length have the same resistance, which has the larger diameter? An electronic device designed to operate at any temperature in the range from –10.0ºC to 55.0ºC contains pure carbon resistors. (See Figure 2.). ), 2. As you might expect, the cylinder’s electric resistance size 12 {R} {} is directly proportional to its length Figure 1. This is useful for making a temperature-independent resistance standard, for example.

It is measured in Ohms. (a) To what temperature must you raise a copper wire, originally at 20.0ºC, to double its resistance, neglecting any changes in dimensions? The resistance of a sample of mercury is zero at very low temperatures—it is a superconductor up to about 4.2 K. Above that critical temperature, its resistance makes a sudden jump and then increases nearly linearly with temperature. Resistivity is defined as the resistance offered by the material per unit length for unit cross-section.

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