The ends of a length of wire are labeled a and b. If the current in the wire is
Want to see the full answer?
Check out a sample textbook solutionChapter 1 Solutions
Modified Masteringengineering With Pearson Etext -- Standalone Access Card -- For Electrical Engineering: Principles & Applications
Additional Engineering Textbook Solutions
Programmable Logic Controllers
ELECTRICITY FOR TRADES (LOOSELEAF)
Fundamentals of Applied Electromagnetics (7th Edition)
Electric machinery fundamentals
Principles and Applications of Electrical Engineering
Engineering Electromagnetics
- A copper (Cu) wire with a radius of 4 mm is connected to the end with an aluminum (Al) wire with a radius of 2 mm. Since a current of 20π milliamperes (mA) flows through the wires, which of the following is the current density in each wire correctly?arrow_forwardDetermine the resistance of a bus bar made of aluminum at 50°C if the length is 15 meters long and cross section is 9cm2arrow_forwardA wire 4.53 m long and 7.55 mm in diameter has a resistance of 12.0 mΩ. A potential difference of 18.8 V is applied between the ends. (a) What is the current in amperes in the wire? (b) What is the magnitude of the current density? (c) Calculate the resistivity of the material of which the wire is made.arrow_forward
- A wire 4.0 m long and 6.0 mm in diameter has a resistance of 15.0 mΩ. A potential difference of 23.0V is applied between the ends. (a) What is the current in the wire? (b) What is the current density? (c) Calculate the resistivity of the wire materialarrow_forwardDiscussions:Voltage Distribution and String Efficiency of a Model Suspension Insulator 1- Comment on the results obtained.2- Give reasons for unequal potential distribution over the string.3- What is the effect of this un equality on the insulators?4- Can value of the string efficiency being equal to 100%. Explain your answer.5- Outline methods used to equalize the potential across the units.6- Why an insulator is represented as a capacitor C? What are the assumptionmodes?arrow_forwardA wire of 59 in length and 4 mm2 has a resistance of 0.94 ohms. A 110-m length of wire of the same material has a resistance of 3 at the same temperature. Find the radius of this wire. The final unit must be in millimeter, mm.arrow_forward
- The number n of free electrons per m3 in the current carrying cable is iBL/VHeA. (A is the crosssectional area of it.) Where n is obtained from? a. The current density J’s expression b. Ohm’s Law c. The resistivity’s expression E/J d. Faraday’s Law.arrow_forwardsolve a,b and c please. In a concentric spherical electrode system, the outer radius is 15cm, the perforation of the insulator between the spheres since its resistance is 90 kV / cm, a) Obtain the equation for the breakdown voltage. b) Since 300kV is applied between the electrodes, r1 (inner radius) can be taken to prevent piercing of the system. what range are the values? c) What is the maximum voltage value that the system can withstand?arrow_forwardA cylindrical copper rod having a diameter of 0.40 in has a resistance of 0.00264 Ω. Taking the resistivity of copper as 1.745 µΩ-cm at 20o C, determine the length of the rod in ft. resistance of the rod when it is drawn down to one-third of the initial diameter, the volume remaining unchanged. Assumed that the resistivity of the copper is not affected by the drawing process.arrow_forward
- According to the figure below, wire section 1 of diameter D1 = 8 R and wire section 2 of diameter D2= 4R connected by a tapered section. The wire is copper, its resistivity uniformly distributed across any cross-section area through the wire's width. The electric potential change V along the length L = 4 m shown in section 2 is 20 µV. The number of charge carriers per unit volume is 8.49 x 1028 m3.What is the drift speed of the conduction electrons in section. 1.69 x 10-8 Qm and carriers a current. Assume that the current isarrow_forwardA wire of diameter 1mm and conductivity 5x107 S/m has 1029 free electrons /m3 when an electric field of 10mV/m is applied. Determine: (a) current density (b) current in the wire (c) charge density of free electronsarrow_forwardFind the total current flowing (in ampere) in a cylindrical conductor (solid wire) 1 meter long and a diameter of 1mm. Given also that its charge density (De) is 1029 carriers/m3 and its carrier velocity (u) is 19.9x10-6 m/s.arrow_forward
- EBK ELECTRICAL WIRING RESIDENTIALElectrical EngineeringISBN:9781337516549Author:SimmonsPublisher:CENGAGE LEARNING - CONSIGNMENT