Answered: A 230 V shunt motor takes a total…

A 230 V shunt motor takes a total current of 35 A. If the field winding resistance is 65Ω and the armature resistance of 0.4Ω, Determine the (a) Current in the armature (b) Back emf

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter14: Inductance

Section: Chapter Questions

Problem 13CQ: Does the time required for the current in an RL circuit to reach any fraction of its steady-state...

See similar textbooks

Related questions

Q: A motor has an armature resistance of 3.65ohms. If it draws 8.20A when running at full speed and…

Q: How can it be shown that resistance alone does not determine the current to a motor armature? Why…

A: The armature of a motor is in every way similar to that of a generator. The conductors on the…

Q: How many coils must a loop have with a cross-sectional area of 0.50m? that is pulled through a…

A: E =4V, A = 0.5m2 B = 0.25T, ∆t = 1sec The induced emf in the coil is E = N.BA/∆t N = ∆t.E /BA N =…

Q: A 9.5-V battery, a 5.07-Ω resistor, and a 9.8-H inductor are connected in series. After the current…

A: Dear student, According to the guidelines I am allowed to answer only three…

Q: You want to design a linear motor that can deliver 1 hp at a steady bar velocity of 20 m/s. The flux…

Q: The wiring in a motor has resistance of 1.2 Q and produces a back emf of 0.62 V when connected to a…

A: Given: The resistance of wiring motor R = 1.2 Ω back emf produced by the motor ε = 0.62 V potential…

Q: A small rectangular loop of wire is located close to a long straight wire initially carrying a…

A: Given value--- Current = 106 Amp. time interval = 1/136 s. We have to find--- Find the average…

Q: A flat coil of wire has an area A, N turns, and a resistance R. It is situated in a magnetic field,…

Q: An inductance of 1 henry and a resistance of 10 ohms are connected in series with an electromotive…

A: L = 1H R = 10 Ohm V0 = 120 Volt Now, by kirchoff law V0 - Ldi/dt - i R = 0 By solving this…

Q: A 12H inductors carries a current of 2A. At what rate must the current be changed to produce a 60V…

A: The equation for the rate at which the current has to be changed can be obtained as

Q: The square loop in FigureP20.62 is made of wires with atotal series resistance of 10.0 Ω.It is…

Q: In resistor xy (as shown in Fig.), find the direction of current with the help of Lenz’s law. (a)…

A: When the switch Z is closed for several minutes then open, the magnetic field to the right…

Q: For a class demonstration, a professor needs to create a solenoid using copper wire with diameter d…

Q: Consider the circuit shown in Figure P20.43. Takeε = 6.00 V, L = 8.00 mH, and R = 4.00 Ω. (a) What…

A: Formula to calculate the inductive time constant of the circuit is,

Q: Below is a Motional EMF problem with a sliding, conducting bar connecting a wire loop within a…

A: Given:- The velocity of the bar V = 25.0 m/s The magnetic field B = 0.640 T The resistance in the…

Q: Using applications of Differential Equations. If the circuit is moved to position 2, find the…

Q: A 120.0-V motor draws a current of 9.65 A when running at normal speed. The resistance of the…

A: Given data: The voltage =120.0 The resistance =9.65 A The resistance =0.752 Ω

Q: You are camping in the wilderness. After a few days, you are horrified to discover that you did not…

A: Given data: Angular speed =2.5 rev/sec ε0=55 v w0=1600 rev/min ε=8 v Find: Average back emf of the…

Q: A motor has coils with a resistance of 15 N and operates from a voltage of 240 V. When the motor is…

A: Given Data: The given resistance is: R=15 Ω The voltage of the circuit is: ε=240 V The back emf at…

Q: For a technical application, an electrical engineer needs to create a solenoid using copper wire…

Q: The solenoid whose inductance is L = 20.0 H is connected in series to a resistor R = 10.0 N and a…

Q: 24. An inductance of L Henrys and a resistance of 20 ohms are connected in series with EMF of 120…

Q: What is the back emf of a 120 V motor that draws 8.00 A at its normal speed and 20.0 A when first…

Q: Why Hysteresis Losses of DC motor is constant? a. It does not depends on load current b. none…

A: Why Hysteresis Losses of DC motor is constant?a. It does not depends on load current b. none of the…

Q: A metal rod makes contact with a partial circuit and completes the circuit. The circuit area is…

A: Given: B=0.150 T V=2.00 m/s R=3.00 ohm…

Q: 0.5m 500 0 05 m B= 25, 5cos(120nt – 30°) (T) 500 Q resistance is connected to the square shaped…

Q: A solenoid with 475 turns has a length of 6.00 cm and a crosssectionalarea of 2.80 x 10-9 m2. Find…

A: Let the number of turns in the coil be denoted by N, and let the length of the solenoid be denoted…

Q: A shunt generator supplies a 27kW load at 205V through cables of resistance, R = 112mn. If the field…

Q: The magnetic field in the region between the poles of an electromagnet is uniform at any time, but…

Q: A 200 V d.c shunt motor takes 45 A.When running at 750 r.p.m. It has an armature resistance of…

A: Back emf in DC shunt motor is given by Eb = V-lara also , back emf is given by Eb = KnϕN Torque T…

Q: Consider the magnetic circuit in the following figure. Assuming that the core (µ, = 2000) has a…

A: Given: Current through coil, Relative permeability of coil, No. of turns, Area of cross-section,…

Q: The rosistance of a copper wire used to make a motor is 0.5 Q at 25°C and 0.8 at the notor's…

A: Write the formula for the resistivity of the copper.

Q: Consider a 300-turn coil with a surface area of a cm?. The length of the coil is 15,0 cm. The…

A: The self-inductance of the coil is

Q: An air-cored solenoid has a cross section of diameter 10 cm and 60 cm long. It is wound with 1000…

Q: The rod shown below moves to the right on essentially zero-resistance rails at a speed of v = 2.9…

A: For finding the current:

Q: A metal bar with length L= 0.50 m , mass m = 80 gram, and resistance R = 5 Qis placed on fri…

A: We need to calculate the power converted to thermal energy once the terminal speed is reached.

Q: The armature coil of a d.c. motor has a resistance of 0.2 N and is connected to a 120 V supply. Find…

A: Find the armature current. I=V-ER Here, V is the applied voltage, E is the emf, and R is the…

Q: For a technical application, an electrical engineer needs to create a solenoid using copper wire…

Q: In the circuit below, the switch S Closed, Take E= 10.0 V, R,=50 KQ, Ez=100k, and C= 10UF, Determine…

A: E = 10 volts R1 = 50000 ohm R2 = 100000 ohm C = 10×10-6 F = 10-5 F

Q: At what speed must the sliding rod in the figure below move to produce an emf of 1.10 V in a 1.77 T…

Q: A circular loop of wire 50 mm in radius carries a current of 100 mA. Find the magnetic energy…

A: The magnetic field at the center of the loop is B = μo4π2 π Ir where, I is the current and r is the…

Q: An alternating current is given by i = 2cos(50pt – 0.4) amperes, where t is time in seconds.…

Q: The armature current of the series dynamo is 15 A. Rotor winding resistance 2.4 N, excitation…

A: Given: The armature current is Ia=15 A. The rotor winding resistance is Ra=2.4 Ω. The excitation…

Concept explainers

Voltage Across Inductor

An actor is a passive electrical component that consists of a coil bent in the form of wire which uses electromagnetism to produce electric current through the coil. When the electric current flows through a conductor that is the coil, a magnetic flux is developed around the conductor. This flow of current through the coil creates a magnetic field based on Fleming's Right-hand thumb rule. If there is any decrease in the current passing through the inductor, then the magnetic field will also decrease and energy is released through the generation of electric current. There is also a secondary voltage inducing in the same coil due to the magnetic flux, since it opposes any changes in the electric current flowing through the circuit. An inductor is also called choke, coil, or solenoid. A choke is designed to block certain frequencies when the DC current passes. A winding coil is coated with insulation to give extra insulation and protect the circuit. They are usually tightly wrapped around a central core which is cylindrical in nature so that the magnetic flux can be induced. The solenoid is a three-dimension coil that is used to exhibit electromagnetism when the magnetic field is developed due to the current flowing through the coil. The sign convention of the inductor is the same as the power dissipating device. When the current flows into the positive side of the voltage across the inductor, the value is positive and the inductor dissipates power whereas when the inductor releases the power back to the circuit, the current has a negative sign convention. 

Question

A 230 V shunt motor takes a total current of 35 A. If the field winding resistance is 65Ω and the armature resistance of 0.4Ω, Determine the (a) Current in the armature (b) Back emf

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.

Similar questions

A small series-wound dc motor is operated from a 12-V car battery. Under a normal load, the motor draws 4.0 A, and when the armature is clamped so that it cannot turn, the motor draws 24 A. What is the back emf when tire motor is operating normally?
The armature and field coils of a series-wound motor have a total resistance of 3.0 . When connected to a 120-V source and running at normal speed, the motor draws 4.0 A. (a) How large is tire back emf? (b) What current will the motor draw just after it is turned on? Can you suggest a way to avoid this large initial current?
Design a current loop that, when rotated in a uniform magnetic field of strength 0.10 T, will produce an emf =0 sin t. where 0=110V and 0=110V .
If emf of the battery of Figure 14.12(b) is reduced by a factor of 2, by how much does the steady-state energy stored in the magnetic field of the inductor change?
Check Your Understanding For the circuit of in Figure 14.12(b), show that when steady state is reached, the difference in the total energies produced by the battery and dissipated in the resistor is equal to the energy stored in the magnetic field of the coil.
Does the time required for the current in an RL circuit to reach any fraction of its steady-state value depend on the emf of the battery?
Does the induced emf always act to decrease the magnetic flux through a circuit?
Two infinite solenoids cross the plane of the circuit as shown below. The radii of the solenoids are 0.10 and 020 m, respectively, and the current in each solenoid is changing such that dB/dt50.0T/s . What are die currents in die resistors of the circuit?
A motor has an armature resistance of 3.65ohms. If it draws 8.20A when running at full speed and connected to a 120V line, how large is the back emf?
A 120-V, series-wound motor has a field resistance of 80 Ω and an armature resistance of 10 Ω . When it is operating at full speed, a back emf of 75 V is generated. (a) What is the initial current drawn by the motor? When the motor is operating at full speed, where are (b) the current drawn by the motor, (c) the power output of the source, (d) the power output of the motor, and (e) the power dissipated in the two resistances?
When a portable fan is first turned on it draws 4.25 AA. After it has come up to speed it draws 0.50 AA. Assuming the fan runs off a 120 VV outlet, calculate the back emf while the motor is running.
A DC motor delivers power to a load at a speed of 1500.0 r/min. The armature current drawn by the motor is Ia = 130 A. The armature circuit resistance of the motor is R = 0.1 Ω and total losses are Pf = 400 W. On the motor nameplate it says U = 280 V and P = 2850.0 W. a) Determine the power developed in the rotor: b) Determine the mechanical power delivered by the engine: c) Determine the load torque at the specified load: d) What is the efficiency of the engine: