Aluminum at 20°C has a resistivity of 2.65×108 m¹ if the temperature is increased to 60°C estimate the new resistivity.
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- Help?A thin copper wire with a diameter 2.5 mm is connected to a 1.2-V potential difference, a current of 2.0 amps flows through the wire. The resistivity of copper is 1.72 × 10-8 Ω ∙ m. What is the length of the wire?Iron has a resistivity of 9.71×108 m at 20°C. What will the resistivity of Lead when then temperature is increased to 135°C. (Take a as 6.51×10³)
- 2) Resistivity is a property of a particular material and can be used to calculate the resistance of a sample. a) Provide an equation for calculating the resistivity of a material. b) Calculate the resistance of 50m roll of copper wire which has a cross sectional area of 5mm^2 if the resistivity of copper is 1.72 x 10^-8 ohm metres.Nichrome has a resistivity of 100×108 2m at normal temperature. Estimate the resistance at 250°C.The resistivity of pure germanium = 600 x 10-³ Nm. Calculate the resistance of a cylinder of pure germanium with a radius of 1.5 mm and a length 7.0 mm. Note the units of millimeters. R= How long would a cylinder of this radius need to be in order for the resistance of pure germanium to be equal to 2250 ohms? L= mm
- A new material is found to be superconducting below 77 K. How much resistance will a 75 mm long sample of this material have if it is at a temperature of 69.3 K while connected to a 6.4 V AC-power supply? R = How much thermal energy will it generate?Thermal energy generated =At what temperature will gold have a resistivity that is two times the resistivity of tungsten at room temperature?°CProblem 3: A 1.2 g wire has a density of 2.7 g/cm3 and a resistivity of 2.7 × 10−8 Ωm. The wire has a resistance of 15 Ω. a) How long is the wire? b) The wire is made up of atoms with valence 1 and molar mass 26.98 g/mol. What is the drift speed of the electrons when there is a voltage drop of 30 V across the wire?