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The temperature dependence of resistance is also quantified by the relation
where
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POWER SYS. ANALYSIS+DESIGN
- Draw equivalent circuits at each time point. LABEL and draw your own voltage and current arrows. DO NOT just label current arrows that may be provided on some circuits. 1. Determine the following assuming the following: a. Vbc b. Va C. Q670u 670 μΕ %3D d. Qaou %3D 36 V е. Сед f. U670u %3D 40 µF g. U40u 2. Determine the following based on the given(s): B a. Q220u b. Qsou 36 V с. Сед 50 µF 220 µF d. Uz2ou e. Usou I| || || I|||arrow_forwardA coil of aluminium wire has a resistance of 50 2 when its temperature is 0°C. Determine its resistance at 100°C if the temperature coefficient of resistance of aluminium at 0°C is 0.0038/°Carrow_forwardA coil is wound from a 10 m length of copper wire having a cross sectional area of 1.0 mm². Calculate the resistance of the coil if its resistivity is 1.59 x 10-³ m.arrow_forward
- Two 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 ?arrow_forwardThe length and diemeter of a copper wire are found to be 100 and 0.002 m, respectively. Consider that the resiativity of the copper wire is 1.72 x 10 -m. Calculate the valne of the resistance.arrow_forwardA cylindrical copper having a diameter of 0.4 in. has a resistance of 0.00264 Ω. Taking the resistivity of copper as 1.745 µΩ-cm at 20ºC. Determine length of rod in ft. resistance of rod when it is drawn down to 1/3 the initial diameter with the volume remaining unchanged. Assume that the resistivity of the copper is not affected by drawing process.arrow_forward
- The temperature coefficient of a wire of conducting materials is 0.004/°C at 20°C. The resistance of the wire rises to 1.24 times of its first value, when temperature of the wire is increased to 45 65 50 85 80 none of the abovearrow_forwarda) An aluminum wire 7.5m long is connected in parallel with a copper wire 6m long. When a current of 5A is passed through the combination, it is found that the current in the aluminium wire is 3A. If the diameter of the aluminium wire is 1mm, determine the diameter of the copper wire. Assume the resistivity of copper to be 0.017µ0m and that of aluminium to be 0.028 HOm.arrow_forward2. If a circuit violates Kirchhoff's laws, it is not solvable. State which one(s) of the circuits in figure 1.23 is/are not solvable. For each of the solvable circuits, find the unknown current I, and the unknown voltage V₁. 192 -- IA 2A IV (a) 302 (c) 152 202 1₂ IV ΙΩ -V₂ + 352 -6²² ): 60³²0 2V IA 2A 4A († (d) 8V Figure 1.23: Circuits for Problem 2 2V (b) 192 1₂arrow_forward
- A copper coil, when connected to a 30-volt supply, initially takes a current of 3 A and has a mean temperature of 20 Cº. After some time, the coil's current falls to 2.85 A while the supply voltage remains the same. The mean temperature of the coil is then 33.4 Cº. Determine the temperature coefficient of resistance at 0 Cº.arrow_forwardA copper coil, when connected to a 30-volt supply, initially takes a current of 3 A and has a mean temperature of 20 C°. After some time, the coil's current falls to 2.85 A while the supply voltage remains the same. The mean temperature of the coil is then 33.4 Cº. Determine the temperature coefficient of resistance at 0 Cº.arrow_forwardAn aluminum wire 5m long and 2mm diameter is connected in parallel with a copper wire 3m long. The total current is 4 A and that in the aluminum wire is 2.5 A. Find the diametre of the copper wire. The resistivity of copper wire being 1.7 micro ohm meter and that of aluminum taken Al 2.6 micro ohm meterarrow_forward
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