EBK PRINCIPLES OF ELECTRIC CIRCUITS
10th Edition
ISBN: 9780134879499
Author: Buchla
Publisher: YUZU
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 4, Problem 2CDQ
If the voltage across a fixed resistor goes from 10 V to 7 V, the power in the resistor
- 1. increases
- 2. decreases
- 3. stays the same
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A.With the aid of a diagram, describe fringing, and explain the impact that it has on the relevant magnetic circuit parameter.
B. A coil of 1500 turns give rise to a magnetic flux of 2.5 mWb when carrying a certain current. If this current is reversed in 0.2 s, what is the average value of the e.m.f. induced in the coil?
C.Define Mutual Inductance.Two coils are connected in series and their total inductance is measured as 0.12 H, and when the connection to one coil is reversed, the total inductance is measured as 0.04 H. If the coefficient of coupling is 0.8, determine:The self-inductance of each coil, and the mutual inductance between the coils.
comparing Lenz's law and the left hand generator rule, which of these is the more important fundamental principle?
Example: Electric Field and Potential Inside a Charged Sphere
Problem: A sphere of radius R = 0.2 m is uniformly charged with a total charge Q = 5 μC. The sphere
is made of a dielectric material with relative permittivity € = 4. Calculate:
1. The electric field intensity E(r) inside and outside the sphere.
2. The electric potential (r) at any point inside the sphere.
Solution:
Step 1: Given Data
Radius of the sphere: R = 0.2m,
Total charge: Q-5 μC=5× 10° C.
Step 2: Electric Field Inside the Sphere (<
Using Gauss's Law:
Chapter 4 Solutions
EBK PRINCIPLES OF ELECTRIC CIRCUITS
Ch. 4 - If 100 W of power occurs for 30 s, how much...Ch. 4 - Express the following amounts of power in watts...Ch. 4 - Prob. 3RPCh. 4 - How many kilowatt-hours are used by a 1/2 hp motor...Ch. 4 - Determine P in each circuit of Figure 4-2 for the...Ch. 4 - A 100 W light bulb operates on 120 V. How much...Ch. 4 - Prob. 7RPCh. 4 - A 0.25 W, 1.0 k resistor is connected across a 12...Ch. 4 - How will the total power delivered change if the...Ch. 4 - A power supply has an efficiency of 92%. If PIN is...
Ch. 4 - A certain battery delivers 10 A for 6 h. What is...Ch. 4 - The kilowatt-hour is a unit of power.Ch. 4 - One watt is equal to one joule per second.Ch. 4 - 0.050 W is the same as 50 mW.Ch. 4 - Prob. 4TFQCh. 4 - The kilowatt and the horsepower are both units of...Ch. 4 - The power rating of a resistor should always be...Ch. 4 - The amount of heat that a resistor can dissipate...Ch. 4 - If the voltage across a resistor doubles, the...Ch. 4 - Watts law states that power equals voltage times...Ch. 4 - If the current through a resistor doubles, the...Ch. 4 - Within limits, a regulated power supply can...Ch. 4 - The efficiency of a power supply can be expressed...Ch. 4 - A power supply that has a negative output voltage...Ch. 4 - A battery Ah rating is a guide to the amount of...Ch. 4 - When analyzing a circuit problem, you should...Ch. 4 - Power can be defined as 1. energy 2. heat 3. the...Ch. 4 - Two hundred joules of energy are consumed in 10 s....Ch. 4 - If it takes 300 ms to use 10,000 J of energy, the...Ch. 4 - In 50 kW, there are 1. 500 W 2. 5,000 W 3. 0.5 MW...Ch. 4 - In 0.045 W, there are 1. 45 kW 2. 45 mW 3. 4,500 W...Ch. 4 - For 10 V and 50 mA, the power is 1. 500 mW 2. 0.5W...Ch. 4 - When the current through a 10 k resistor is 10 mA,...Ch. 4 - A 2.2 k resistor dissipates 0.5 W. The current is...Ch. 4 - A 330 resistor dissipates 2 W. The voltage is 1....Ch. 4 - If you used 500 W of power for 24 h, you have used...Ch. 4 - How many watt-hours represent 75 W used for 10 h?...Ch. 4 - A 100 resistor must carry a maximum current of 35...Ch. 4 - The power rating of a resistor that is to handle...Ch. 4 - A 22 half-watt resistor and a 220 half-watt...Ch. 4 - When the needle of an analog ohmmeter indicates...Ch. 4 - A 12 V battery is connected to a 600 load. Under...Ch. 4 - A given power supply is capable of providing 8 A...Ch. 4 - A power supply produces a 0.5 W output with an...Ch. 4 - If the current through a fixed resistor goes from...Ch. 4 - If the voltage across a fixed resistor goes from...Ch. 4 - A variable resistor has 5 V across it. If you...Ch. 4 - If the voltage across a resistor increases from 5...Ch. 4 - If the resistance of a load connected to a battery...Ch. 4 - If the amount of time that a battery supplies...Ch. 4 - If the current that a battery supplies to a load...Ch. 4 - If there is no load connected to a battery, its...Ch. 4 - If the output voltage of a power supply increases,...Ch. 4 - For a constant power supply output voltage, if the...Ch. 4 - For a constant power supply output voltage, if the...Ch. 4 - If the load is removed leaving the power supply...Ch. 4 - Prove that the unit for power (the watt) is...Ch. 4 - Show that there are 3.6 106 joules in a...Ch. 4 - What is the power when energy is consumed at the...Ch. 4 - How many watts are used when 7,500 J of energy are...Ch. 4 - How many watts does 1,000 J in 50 ms equal?Ch. 4 - Convert the following to kilowatts: 1. 1,000 W 2....Ch. 4 - Convert the following to megawatts: 1. 1,000,000 w...Ch. 4 - Convert the following to milliwatts: 1. 1 W 2. 0.4...Ch. 4 - Convert the following to microwatts: 1. 2 W 2....Ch. 4 - Convert the following to watts: 1. 1.5 kW 2. 0.5...Ch. 4 - Prob. 11PCh. 4 - If a 300 W bulb is allowed to burn continuously...Ch. 4 - At the end of a 31-day period, your utility bill...Ch. 4 - Convert 5 106 watt-minutes to kWh.Ch. 4 - Convert 6,700 watt-seconds to kWh.Ch. 4 - For how many seconds must there be 5 A of current...Ch. 4 - If a 75 V source is supplying 2 A to a load, what...Ch. 4 - If a resistor has 5.5 V across it and 3 mA through...Ch. 4 - An electric heater works on 120 V and draws 3 A of...Ch. 4 - What is the power when there are 500 mA of current...Ch. 4 - Calculate the power dissipated by a 10 k resistor...Ch. 4 - If there are 60 V across a 680 resistor, what is...Ch. 4 - A 56 resistor is connected across the terminals...Ch. 4 - If a resistor is to carry 2 A of current and...Ch. 4 - A 12 V source is connected across a 10 resistor....Ch. 4 - The maximum voltage is 1 V and the maximum current...Ch. 4 - A 6.8 k resistor has burned out in a circuit. You...Ch. 4 - A certain type of power resistor comes in the...Ch. 4 - For each circuit in Figure 414, assign the proper...Ch. 4 - A 50 load uses 1 W of power. What is the output...Ch. 4 - Assume that an alkaline D-cell battery can...Ch. 4 - What is the total energy in joules that is...Ch. 4 - A battery can provide an average of 1.5 A of...Ch. 4 - How much average current can be drawn from an 80...Ch. 4 - If a battery is rated at 650 mAh, how much average...Ch. 4 - If the input power is 500 mW and the output power...Ch. 4 - To operate at 85% efficiency, how much output...Ch. 4 - Prob. 39P
Knowledge Booster
Learn more about
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
- please remember to draw the circuitsarrow_forwardA balanced three-phase, A - connected induction motor consumes 3246 W when the l voltage is 208 V, and the line current is 10.6 A. Calculate: i. The motor's winding resistance. ii. The motor's winding reactance. 12 marrow_forwarda) An iron ring, having a mean circumference of 250 mm and a cross-sectional area of 400 mm², is wound with a coil of 70 turns. Using the following data, calculate the current required to set up a flux of 510µWb in the ring. H (A/m) 350 600 1250 B (T) 1.0 1.2 1.4 b) Calculate also: i. The inductance of the coil at the current obtained in Question 2 (a) above. ii. The self-induced e.m.f. if this current is switched off in 0.005 s. Assume that there is no residual flux.arrow_forward
- A balanced three-phase, 1351-V, 60-Hz, A-connected source feeds a balanced Y- connected load with a per-phase impedance of 360 + j150 Q as shown in Figure 1. Calculate: i. The readings on each of the wattmeters ii. The power factor of the load using the wattmeter readings. NOTE: i. ii. Let VAN be the reference phasor, and the phase sequence be ABC anticlockwise. Assume the voltage-drop on the conductors between the source and the load to be zero volts. V b V₁ W 000 000 ; A 360 + j150 360 + j150 4 b 0000 000 B 360 + j150 C W₂ Figure 1arrow_forwarda) Three 30 2 resistors are arranged as shown in Figure 1 below. They are connected to a 480 V three-phase supply. The phase sequence is RYB anticlockwise. Calculate: i. The total power drawn by the circuit using the phase parameters. ii. The power read by each wattmeter. b) If Za, one of the 30 2 resistors, is now removed from the circuit, calculate: R- i. The line currents: IR, Iv, and la ii. The power read by each wattmeter. iii. The total power drawn by the two resistors. W₁ Be- W2 www 'R 22 12 B Figure 1arrow_forwardA certain magnetic circuit may be regarded as consisting of three parts, A, B and C in series, each one of which has a uniform cross-sectional area. Part A has a length of 300 mm and a cross- sectional area of 450 mm². Part B has a length of 120 mm and a cross-sectional area of 300 mm². Part C is an airgap 1.0 mm in length and of cross-sectional area 350 mm². The flux in the airgap is 0.35 mWb. Neglect magnetic leakage and fringing. The magnetic characteristic for parts A and B is given by: H (A/m) 400 560 800 1280 1800 B (T) 0.7 0.85 1.0 1.15 1.25 Calculate: i. The reluctance of each part, that is, of Part A, Part B, and Part C ii. The total reluctance of the magnetic circuit. iii. The total m.m.f.arrow_forward
- HW_02.pdf EE 213-01 Assignments HW_#2 Toms are as muIcate uah.instructure.com b Answered: HW_#1 HW_01.pdf EE 213-01 Assignments P Pearson MyLab and Mastering uah.instructure.com P Course Home Watc... ✓ Download → Info × Close 1) (5 pts)For the circuit shown, find the value of Ia, Ib, Ic and Va: Ib 10 Ohms + Ic 40 Ohms 20 Ohms 70 Volts a Page 1 > of 2 - ZOOM + pui via Canvas Hint: use KCL to find Ic in terms of la and lb, use KVL around the right loop to find a relationship between la and lb, use KVL around the outer loop to solve for a current value (use ohms law for the voltage drops across the resistors) 2) (5 pts) – For problem 1, show that the power supplied (delivered) by the source equals the power absorbed by the resistors. 3) (5 pts) Determine the equivalent resistance looking into terminals a-b for the two circuits shown. Use series and parallel resistor combinations. Hint: work from the opposite end of terminals a-b towards terminals a-b a) 24 Ohms 10 Ohms 8 Ohms G a REQ b)…arrow_forwardA three-phase load consists of three identical impedances connected in delta. The impedances have a value of (100 + j40) Q. The supply voltage is 440 V. The two- wattmeter method is used to determine the total power drawn by the load. One wattmeter, W₁, has its current coil connected in the blue line and its voltage coil connected between the yellow and blue lines. Calculate: a) The power measured by each wattmeter b) The power factor of the load using the wattmeter readings c) The apparent power supplied to the load d) The reactive power drawn by the load.arrow_forward4- A 75 KW, 250 V shunt generator has R₁ = 0.03 2 and RF =50 2. The generator has 6 poles and is lap wound with totally 400 conductors. The generator runs at 600 rpm on full load. The bore of the machine is 42 cm (in diameter), its axial length is 28 cm and each pole subtends an angle of 54 °. Field pole a) b) c) Find the airgap flux density. (10 pt) Find the induced voltage under full load. (10 pt) Find the average number of active conductors. (5 pts) 28 cm 21 cm 60° Armaturearrow_forward
- a) The phase currents in a delta - connected three-phase load are as follows: between the red and yellow lines, 60 A at p.f. 0.9 leading; between the yellow and blue lines, 40 A at 0.95 p.f lagging; between the blue and red lines, 50 A at p.f. 0.8 lagging. The supply voltage is 240 V. Draw a labeled diagram of the circuit and calculate the line currents. Note: Use VRY as the reference phasor. b) The two-wattmeter method is used to measure the total power drawn by the load in 1 (a) above. Wattmeter one has its current coil connected in the yellow line and its voltage coil connected between the yellow and red lines. Calculate: i. The power measured by each wattmeter. ii. The power factor of the load.arrow_forwardQUESTION NO. 1 a) State Lenz Law b) Explain Flux density c) A wire, 100 mm long, is moved at a uniform speed of 4 m/s at right angles to its length and to a uniform magnetic field. Calculate the density of the field if the e.m.f. generated in the wire is 0.15 V. If the wire forms part of a closed circuit having a total resistance of 0.04 2, calculate the force on the wire in newtons.arrow_forwardIn Figure (a) the drawing of the bipolar circuit was as shown in Figure 4. Draw me a unipolar circuit and how it will be in Figure (b). Please draw the circuit with the transistors.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Kirchhoff's Rules of Electrical Circuits; Author: Flipping Physics;https://www.youtube.com/watch?v=d0O-KUKP4nM;License: Standard YouTube License, CC-BY