A wire has a resistance 10 S2. It is stretched by one-tenth of the original length. Then its resistance will be (а) 10 Q (c) 9 2 (b) 12.1 2 (d) 11 2
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- A given wire has a resistance of 17-5 ohms. If its length is 560m, how much length must be cut-off from the wire in order to reduce its resistance to 12.5 ohms.A 1600m long copper cable is made up of 7 wires each having a diameter of 1.7mm. Calculate the resistance of the cable if the specific resistance of copper is 1.75 x 10e-8 ohm – m.A wire with 3 micron radius is made from 9 cm copper, 0.5 cm iron, and 11 cm copper all joined end to end (i.e., in series). Assume the joints are perfect and have no additional resistance. What is the total resistance of the wire?
- A circular copper wire has a cross-sectional area of 2mm2; its resistance is 0.16 Ω at 50°C.Find its resistance at 20°C using: a.Inferred zero resistance formula b.Temperature coefficient formulaA 2-wire d.c. distributor 129 m long at a distance of 56 m is uniformly loaded with 1.4 A/m. Resistance of single wire is 0.00089 Ω /m. If the distributor is fed at one end. Calculate Maximum voltage drop = VB. Copper wire of length (/) connected in parallel with aluminum wire of length (21) and (10mm) diameter, if the current in each wire is the same. Find the diameter of the copper wire if the resistivity of copper is (0.0159 u2-m)& for aluminum is (0.0254 ul-m).
- A copper transmission line is to be replaced by one of aluminum having the same total resistance. If the cross sectional area of the copper wire is 0.005m2 , what would be the cross sectional area of the new aluminum wire? *Draw the diagramA 15 – ft length of wire with a cross – sectional area of 127 cmils has a resistance of 8.74 ohms at20 0C. What material is the wire made from? (1 cmil = 0.7854 x 10 – 6in2)Find the resistance of a circular wire that is 0.5-m long with radius of 1mm and has a resistivity value of 0.03 ohm-meter. 4774.65 ohms 5328.03 ohms 7745.64 ohms 2835.31 ohms
- A given wire has a resistance of 17.5 ohms. If its length is 560m, how much length must be cut off from the wire in order to reduce its resistance to 12.5 ohms. assume to cross sectional area of the wire to be constantTwo wires A & B made from two different materials have temperature coefficient of resistance equal to 0.0025 and 0.0005 ohm per C , respectively . It is desired to make a coil of wire having a resistance of 1200ohms with a temperature coefficient of 0.001 , using suitable lengths of the two given wires connected in series . Determine the required length of wire A ?Solve the following problems with complete solutions and units using 2 decimal digits: An annealed copper wire has a diameter of 0.325 in. and a resistance of 0.6 Ω at 20°C. Calculate its length.