-) The resistance of a 2 km length of cable of cross-sectional area 2 mm² and resistivity of 2 × 10 8 Q2. m is: (3) 0.02 Ω (b) 20 Ω (c) 0.02 mΩ (d) 200 £2 ) A coil of wire has a resistance of 10 52 at 0 °C. If the temperature coefficient of resistance for the wire is 0.004/°C, its resistance at 100 °C is: (a) 0.4 92 (b) 1.4 Ω (c) 14 Ω (d) 10 Ω ) A piece of graphic has a cross-sectional area of 10 mm². If its resistance is 0.1 £2 and its resistivity 10 × 108 2 m, its length is: (a) 10 km (b) 10 cm (c) 10 mm (d) 10 m

-) The resistance of a 2 km length of cable of cross-sectional area 2 mm² and resistivity of 2 × 10 8 Q2. m is: (3) 0.02 Ω (b) 20 Ω (c) 0.02 mΩ (d) 200 £2 ) A coil of wire has a resistance of 10 52 at 0 °C. If the temperature coefficient of resistance for the wire is 0.004/°C, its resistance at 100 °C is: (a) 0.4 92 (b) 1.4 Ω (c) 14 Ω (d) 10 Ω ) A piece of graphic has a cross-sectional area of 10 mm². If its resistance is 0.1 £2 and its resistivity 10 × 108 2 m, its length is: (a) 10 km (b) 10 cm (c) 10 mm (d) 10 m

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Similar questions

5. The rod given in the figure is made up of two different materials. - 25 cm * 70 cm Both have square cross sections of 3 mm side. The resistivity of the first material is 4 x 10-3 2.m and it is 25 cm long while second material has resistivity of 5 x 10-³ Q.m and is of 70 cm long. What is the resistivity of rod between its ends?
The loads on a 300-meter ring distributor are depicted in figure 2.1 (a), where the distances are given in metres. Each conductor has a resistance of 0.20 per 1,000 metres, and the loads that are tapped off at points B, C, and D are as shown in the diagram. Determine the voltages at B, C, and D given that the distributor is fed at point A. 50 A 70 1 240 V A (a) 60 B 70 A 100 A 80 50 A 91A D T 41 A 220 V A (b) 129 A B 100 A 729 A 70 A
A copper cable with a length of 1.00 m starts to conduct a current of 5.00 A when it is connected to a 4.50 V de source. Given that resistivity of the copper, Pcopper = 1.68 x 10-8 2 m. (a) Calculate the resistance of the copper wire. (b) Find the diameter of the copper wire. (c) It is found that the current in the copper wire drops to 4.40 A when its temperature rises by 35.0 °C. The de source remains unchanged. Calculate the temperature coefficient of copper.
Determine the resistance of a busbar made of copper if the length is 16 meters long and the cross area is a 5x5 sq. cm. Use 1.7241 micro ohm-cm as the resistivity. (Provide drawing or FBD)
A #10AWG stranded copper wire has 37 strands, each strand has a diameter of 0.0167 inch, and a length of 1000 ft. If copper has a resistivity of 11.46 Ω-CM/ft at 20 C, and a thermal coefficient of 0.004264/C at 0 C, determine its resistance at 85 C.
(BASIC ELECTRICAL ENGINEERING) A solenoid of iron core has a cross sectional area of 2.33 in2 and has a length of 1.89 ft. If the winding has a 2234 turns of wire what is the reluctance of the circuit? Show your complete solution and limit your answer into 3 decimal place only.
1. Solve the following resistance problems: a. A 4.2 cm long copper wire has a cross-sectional area of 3.7 mm?. Determine the resistance of that wire. Check the resistivity of Copper int the table given in the textbook. b. Consider a 1.6 cm long silver wire. What is the cross-sectional area of the wire for it to have a resistance of 2.2 x 102 0.
The temperature coefficient of resistance of a wire is 0.00125 °C-1. At 30 °C, its resistance is 10. At what temperature will the resistance of the wire be 2 ohms? A current of 4.8 A is flowing in a conductor. Determine the number of electrons flowing per minute through the X-section of the conductor.
2.1.A piece of copper wire has a resistance of 5 : at 20°C. What is its resistance at 100°C? 2.2. If the resistance of a length of copper wire is 7 at 20°C, calculate the resistance at 60°C.
A potential difference of 100 volt exists between the ends of a conductor having length of 300 cm. If its diameter is 0.25 mm and the current through it is 2 A. Calculate the specific resistance of the conductor.
Wire size and voltage drop The cross-sectional area of wire is measured in circular mils (CM). 1 mil = 1/1000 inch CM = squaring of mil Example 1: Find CM for a piece of wire has a diameter of .008 of an inch. .008 = 8/1000 = 8 mils CM = 8² = 64 Find CM for a piece of wire has a diameter of .008 of an inch. 5. Find Cm for a piece of wire has a diameter of .064 of an inch. 6. Find CM for a Wire has 24 strands of wire and each strand is .012 inches in diameter.
1. Resistive conductors tend to heat up when current flows through them. The temperature of the conductor typically depends on the amount of current it carries, where a higher current leads to a higher temperature. Additionally, the resistivity of a metallic conductor increases with increasing temperature. Therefore, the resistance of a piece of metal will generally increase if the current in the metal increases. This effect is usually negligible if the temperature of a circuit element does not vary too much during its operation. However, this effect can be significant in circuit elements that experience large temperature variations, like incandescent light bulbs and the heating elements in a toaster. The main component in an incandescent light bulb is a coiled filament of tungsten that is 580 mm long with a diameter of 46 µm. At 20°C, tungsten has a resistivity of 5.25 × 10-8 · m. Its temperature coefficient of resistivity is 0.0045 (Cº)-1, and this remains accurate even at high…