Answered: A motor operating on 240 V electricity…

A motor operating on 240 V electricity has a 180 V back emf at operating speed and draws a 12.0 A current. (a) What is its resistance? (b) What current does it draw when it is first started?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter13: Electromagnetic Induction

Section: Chapter Questions

Problem 45P: The rod shown below moves to the right on essentially zero-resistance rails at a speed v=3.0m/s . If...

See similar textbooks

Related questions

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 0.8T bar magnet is pushed through a 50.5 turn coli with an area of 0.002m2 in 3.4sec. The

A: Given No of turns = 50.5 Magnetic field B = 0.8 T Area A = 0.002 m2 Time ∆t = 3.4 sec

Q: A long straigt aive twisted into loop of radios is 0.1 m. a Current flows clock wise find the of the…

A: radius (r) = 0.1 m Current (I) = 20 A , clockwise

Q: What is the unit of measurement of the back EMF of a motor?

A: to find : The unit of measurement of back emf of motor

Q: A motor is designed to operate on 117 V and draws a current of 15.3 A when it first starts up. At…

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: Determine the temperature of the field winding of a series motor when its resistance had increased…

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: Design a current loop that, when rotated in a uniform magnetic field of strength 0.10 T, will…

Q: How fast must a straight 0.25m wire move through a 5.5x10-³T magnetic field in order to induce a…

A: Let B denotes the magnetic field, L denotes the wire’s length, V denotes the motional emf, and v…

Q: A current of 5.75 A flows in the coil of wire from an applied voltage of 120 V. The motor operates…

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: A voltage of 2 V is needed in a circular loop of conducting wire. The wire is moved from outside a…

A: Here given a voltage of 2V is needed in a circular loop . The wire is moved from outside a uniform…

Q: The induced voltage across a coil with 250 turns that is located in a magnetic field that 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: How many turns is required for a coil with a diameter of 48 mm to induce 12 v of electricity when…

A: given that,Diameter, d=12 mm=0.12 memf reduced=12 V∆B=310 T∆t=0.2 secθ=18°

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: The rod shown below moves to the right on essentially zero-resistance rails at a speed of v=2.20…

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: .A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. If the…

A: Given Data: Applied voltage, V=110 V Back-emf, ε=98 V Resistance, R=10 Ω ⇒Motor runs at full speed.

Q: The bolt of lightning depicted in the figure passes 200 m from a 90 turn coil oriented as shown. If…

Q: One simple, though impractical, way to generate electrical power is shown below. A bar of metal vith…

A: given: B=0.75 TR = 3 ohmv = 0.4 m/s l= 15 cm = 0.15 m

Q: A 230 V shunt motor takes a total current of 35 A. If the field winding resistance is 65Ω and the…

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: A magnetic field increases from 0 to 0.30 T in 1.7 s . How many turns of wire are needed in a…

Q: The motor in a toy car operates on 6.00 V, developing a 4.50 V back emf at normal speed. If it draws…

A: Formula of current at normal speed of car is as follows: I=Vs-VbR…

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: A car generator turns at 400 rpm when the engine is idling. Its 300 turn, 5.1 cm by 8.15 cm…

Q: In electromagnetic induction, explain the principle why the voltmeter behave the way we observe it?

A: The voltmeter has a large resistance. So, the low current flows in the circuit because the…

Q: What is the current in a wire loop of resistance 10 Ω through which the magnetic flux changes from…

A: Given Magnetic field, ∆φ=10 Wb Time ∆t=1 s Resistance, R=10 Ω

Q: he simple, though impractical, way to generate electrical power is shown below. A bar of metal th…

A: Given data: The magnetic field around the bar, B= 0.75T The velocity of the bar, v=0.4m/s The length…

Q: If a 0.6T bar magnet is pushed through a 50 turn coli with an area of 0.003m2 in 1.9sec. The induced…

A: The expression for the induced voltage(e) can be given as, e = Nϕt, where N is the number of turns…

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

Q: A motor has coils with resistance of 20 Ω and operates from a voltage of 120 V. When the motor is…

Q: Suppose a generator has a peak voltage of 205 V and its 500 turn, 5.5 cm diameter coil rotates in a…

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: A current of 5.75A flows in the coul of wire from an applied voltage of 120V. The motor operates at…

A: I = 5.75 A Vapplied = 120 V Back emf ( E ) = 32 V

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: A metal bar with length L = 0.40 m ,mass m = 200 gram, and resistance R = 10 N is placed on…

Q: A generator is designed to produce a maximum emf of 190 Vwhile rotating with an angular speed of…

A: Maximum emf, eo = 190 V frequency, f = 3800 rpm = 63.3 Hz Area, A = 0.016 m2 Magnetic field, B =…

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: Can the Biot-Savart Law apply to a wire carrying alternating current?

Q: A motor is designed to operate on 117 V and draws a current of 12.2 A when it first starts up. At…

A: Given data: Operating voltage, V = 117 volts Initial Current, I = 9.39 A Normal operating current…

Q: A motor is designed to operate on 117 V and draws a current of 9.39 A when it first starts up. At…

A: Operating voltage = 117 volts Initial Current = 9.39 A normal operating current = 1.73 A

Q: At what angular velocity in rpm will the peak voltage of a generator be 480 V, if its 500-turn, 8.00…

A: Using the equation for the peak emf, ε=NABωω=εNAB=εNπd24B

Q: A generator is made from a set of 50 wire loops of radius 40.0 cm that turn in a uniform 0.0900 T…

Question

A motor operating on 240 V electricity has a 180 V back emf at operating speed and draws a 12.0 A current. (a) What is its resistance? (b) What current does it draw when it is first started?

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 3

VIEW

Step by step

Solved in 3 steps with 4 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 120-V, series-wound motor has a field resistance of 80 and an armature resistance of 10. 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?
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 rod shown below moves to the right on essentially zero-resistance rails at a speed v=3.0m/s . If B = 0.75 T eveywhere in the region, what is the current through the 5.0 resistor? Does the current circulate clockwise or counterclockwise?
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.
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?
The generator of a car idling at 1.582E+3 rpm produces 15.3 V. What will the output be at a rotation speed of 2.886E+3 rpm, assuming nothing else changes? Answer in units of V.
A loop of wire moves with a velocity of 3.0 m/s through a magnetic field whose strength decreases with distance at a rate of 17.0 μT/m . If the loop has an area of 0.75 m2 and internal resistance of 0.58 Ω , what is the current in the wire?
Find the direction of the current in the resistor shown inFigure P20.16 (a) at the instant the switch is closed, (b) afterthe switch has been closed for several minutes, and (c) at theinstant the switch is opened.
How many coils must a loop have with a cross-sectional area of 0.50m? that is pulled through a magnetic field of 0.25T in 1.0s in order for there to be an induced emf of 4 V? If the current in the wire in the previous question is 3.0 A, what is the resistance of the wire?
When running at its operating speed, a 210-V dc motor with an armature whose resistance is 1.90 Ω draws a current of 22.0 A. What is the back emf of the motor when it is operating normally?
A current of 5.75 A flows in the coil of wire from an applied voltage of 120 V. The motor operates at a normal speed and creates a back emf of 32.0 V. What is the resistance of the coil?
Two power lines run parallel for a distance of 283 m and are separated by a distance of 40.0 cm. If the current in each of the two lines is 115 A and if they run in opposite directions, determine the magnitude and direction of the force each wire exerts on the other.