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. 2. Apply Ohm's law to the following problems: a. A current of 0.0021 A flows to a resistor having a resistance of 10.12 0. Calculate the voltage. b. A current of 0.045 A flows to an electrical device. If the resistance of the material is 6.1 Q, what is the voltage of the electrical device? 3. Given the series circuit, solve for the 1.2 Q a. Total resistance 12 V 0.2 Q- b. Current of each resistor

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. 2. Apply Ohm's law to the following problems: a. A current of 0.0021 A flows to a resistor having a resistance of 10.12 0. Calculate the voltage. b. A current of 0.045 A flows to an electrical device. If the resistance of the material is 6.1 Q, what is the voltage of the electrical device? 3. Given the series circuit, solve for the 1.2 Q a. Total resistance 12 V 0.2 Q- b. Current of each resistor

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...

See similar textbooks

Similar questions

You are working as an electrician in a large steel manufacturing plant, and you are in the process of doing preventive maintenance on a large DC generator. You have megged both the series and shunt field windings and found that each has over 10 M to ground. Your ohmmeter, however, indicates a resistance of 1.5 across terminals S1andS2. The ohmmeter indicates a resistance of 225 between terminals F1andF2. Are these readings normal for this type machine, or is there a likely problem? Explain your answer.
Which of the following is the best insulator? a. wood b. thermoplastic c. copper d. cast iron
A good rule-of-thumb to estimate the expected life of a motor, a ballast, or other electrical equipment is that for every ____________ C above rated temperature, the expected life will be cut in __________________.
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?
Suppose you are asked to design auniform wire from 1 g of copperwhose resistivity is 1.72 × 10-8Ω ∙ ?. Ifthe wire is to have a resistance of 0.5 Ω, and all the copper given to you is to be used, what will be the length and diameter of the wire?What will be the length and diameter ofsuch wire, knowing that the densityof copper is 8960 kg/m3.
A piece of silver wire has a resistance of 1 ohm. Determine the resistance of alead wire one-third the length and one-third the diameter if the resistivity of lead wire is 30 times that of silver. NOTE: Please explain where did you get the variables so I can understand them. Thank you
Calculate the cross-sectional area, in mm2, of a piece of copper wire, 40 m in length and having a resistance of 0.25 ohm. Take the resistivity of copper as 0.02 × 10−6 ohm.
A. What is the area in circular mils of a copper wire that has a resistance of 2.5 ohms and is 300ft long (T = 20°C)?b. Show your solution, determine whether the area of an aluminum wire will be smaller or largerthan that of the copper wire using the same resistance and length state in letter A. Explain
complete solution. Find the resistance of analuminum wire that has a length of 200 meters and 1.63 mm diameter. The wire is at 20 OC. Note that the resistivity of aluminum at 20O C is 2.8 x 10^-8 Ω-m.
Determine the resistance of a bus bar made of aluminum at 50°C if the length is 15 meters long and cross section is 9cm2 Note: DRAW THE DIAGRAM
A 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.
Determine the resistance of a bus bar made of aluminum at 50°C if the length is 15 meters long and cross section is 9cm2