ELECTRICITY FOR TRADES (LOOSELEAF)
3rd Edition
ISBN: 9781260437454
Author: Petruzella
Publisher: MCG
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Chapter 4.2, Problem 4RQ
To determine
State why 140-W soldering iron develops more heat than 20-W soldering iron.
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Discuss how impressed current can prevent the corrision of metals.
1. What is the reluctance of 10 cm diameter silicon steel of 2500 permeability with a mean length of 20 cm?
A. 0.000201 cgs
B. 0.000102 cgs
C. 0.000212 cgs
D. 0.000123 cgs
2. At what rate the flux must be varied to measure 12 V across the terminal of 300 turns coil?
A. 0.05 Wb/s
B. 0.04 Wb/s
C. 0.03 Wb/s
D 0.02 Wb/s
how does heat affect the resistance of most metals and their alloys?
Chapter 4 Solutions
ELECTRICITY FOR TRADES (LOOSELEAF)
Ch. 4.1 - What is the practical unit of electric charge?Ch. 4.1 - Prob. 2RQCh. 4.1 - Prob. 3RQCh. 4.1 - Explain what a current flow of 1 ampere can be...Ch. 4.1 - Account for the fact that electric current travels...Ch. 4.1 - Prob. 6RQCh. 4.1 - Prob. 7RQCh. 4.1 - Prob. 8RQCh. 4.1 - Prob. 9RQCh. 4.1 - Prob. 10RQ
Ch. 4.1 - Prob. 11RQCh. 4.1 - Prob. 12RQCh. 4.1 - What is the cause and effect of resistance?Ch. 4.1 - When using an ohmmeter to measure resistance, what...Ch. 4.1 - Convert the following data: a. 12,000 A to kA b....Ch. 4.1 - Prob. 16RQCh. 4.2 - Define electric power.Ch. 4.2 - What is the basic unit used to measure electric...Ch. 4.2 - A toaster draws 8 amperes when connected to a...Ch. 4.2 - Prob. 4RQCh. 4.2 - Prob. 5RQCh. 4.2 - Prob. 6RQCh. 4.2 - Prob. 7RQCh. 4.2 - Compare a closed and an open electric circuit.Ch. 4.2 - Prob. 9RQCh. 4.2 - What does Ohms law tell us about current flow in a...Ch. 4.2 - Ohms law is applied to a circuit using what three...Ch. 4.2 - Prob. 12RQCh. 4.2 - Prob. 13RQCh. 4.2 - Prob. 14RQCh. 4.2 - Prob. 15RQCh. 4.2 - Prob. 16RQCh. 4.2 - Prob. 17RQCh. 4.2 - Prob. 18RQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 10) A certain batch of copper wire was found to have a conductivity of 98% at 20°C. What is its resistivity in un-cm? 11) The resistance of a copper at 30°C is 500. If the temperature coefficient of copper at 0°C is 0.00427. What is the resistance at 100°C?arrow_forwardFerromagnetic materials have this characteristic. A. A relative permeability slightly less than one. B. A relative permeability slightly greater than one. C. A very high resistivity. D. A high relative permeability.arrow_forwardWhich of the following is NOT a variable in voltametric methods? A. How the current is applied B. How the potential is applied C. The inclusion of convection D. All the above E. Type of working electrodearrow_forward
- The primary voltage on the transformer in Figure 2–46 (p. 96) is 120 V rms and NP : NS = 15:1. Diode voltage drops are 0.7 V. (a) What should be the value of RL if the average current in RL must be 0.5 A? (d) Is it alright to measure with an oscilloscope both the input and output waveforms at the same time in Figure 2-46? Why or why not?arrow_forwardThe resistance of a copper wire is (0.92 0) at a temperature of (4 oC). At what temperature will be resistance be (1.06 0)?arrow_forwardWhy does Aluminum conduct electricityarrow_forward
- The resistance of wire increases from 40 – ohm at 20 0C to 50 – ohm at 70 0C. Find the temperature coefficient of resistance at 0 0C.arrow_forwardThe resistance of a copper wire is (0.92 0) at a temperature of (4 oC). At what temperature will be resistance be (1.06 Q)?arrow_forwardCurrent can not flow through an insulator because they have O a. free electrons O b. no free protons O c. no free electrons O d. free neutronsarrow_forward
- A certain batch of copper wire was found to have a conductivity of 98% at 20°C. What is its resistivity in u0-cm?arrow_forward1) what is the potential transformer used for in power substation? 2) what is process leads to lowering the number of free electrons? 3) what is The Townsend's Criterion 4) why Sulphur Hexafluorid has good insulation strength? 5) What is Intrinsic Breakdownarrow_forwardCopper is a Select one: O a. Semiconductor O b. Conductor Super Conductor O d. Insulatorarrow_forward
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