What is the effective resistivity of 95/5 (95% Cu-5% Sn) bronze, which is made from powdered metal containing dispersed pores at 15 vol.%? The resistivity of 95/5 bronze is 1 x 1070 m.
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- A graphite lead (diameter of 0.5mm, length of 5cm) reaches a temperature of 3077K when a voltage difference of 30.7 V is applied across its ends. Find the current (in A) through the lead.Copper wire has a resistivity o = 1.7 x 10-8 22m when at 20°C and it has a temperature coefficient a = 3.9 × 10-3 K-1. A solid cylinder of copper of length L = 85 cm and diameter D = 1.5 mm has one end held at T₁ = 15°C and the other end is held at T2 = 230°C. The temperature increases linearly between the two ends of the cylinder. T₁ dx R= L T₂ Part (a) Consider a thin slice of the copper cylinder of thickness dx that is located a distance x from the left end of the cylinder. Write an equation for the temperature of this slice in terms of the variables x, L, T1, and T2. Part (b) Determine the total resistance in milliohms.estimate the excess temperature for a 1mm diameter horizontal 20cm long chromal wire submerged in a pool of water at atmospheric pressure. The voltage drop in the wire is 14V and the current is 43 A
- A wire sample (0.75 mm in diameter and 20 cm in length) is placed in anelectrical circuit. A voltage drop of 464 mV is measured across the length ofthe wire as it carries a 2 A current. Calculate the electrical conductivity of thisalloy. From Table 4 below, which gives the conductivities of differentmaterials at 20C, identify the material. MaterialElectrical Conductivity(Sm-1)Manganin 2x106Nickel 14x106Aluminium 30x106Copper 50x106Silver 63x106Table 4. Conductivities of different materials at 20 C.A copper wire 100m long with cross-sectional area of 2x10-4 cm2 is heated from room temperature of 25 C to 200 C. Find The drift speed of the “electron group” in the wire, if the current is 3A and density of electrons is 8.5x1028 electrons /m3 The voltage drop across the wire resistor for this current of 3A The power dissipated by resistor.