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?

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?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter13: Electromagnetic Induction

Section: Chapter Questions

Problem 61P: A 120-V, series-wound motor has a field resistance of 80 and an armature resistance of 10. When it...

See similar textbooks

Similar questions

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 .
Suppose that a rectangular toroid has 2000 windings and a self-inductance of 0.040 H. If h = 0.10 m, what is the current flowing through a rectangular toroid when the energy in its magnetic field is 2.0 × 10-6 J?
A coil with an inductance of 2.0 H and a resistance of 10ohm is suddenly connected to an ideal battery with e= 100 V. At 0.10 s after the connection is made, what is the rate at which (a) energy is being stored in the magnetic field, (b) thermal energy is appearing in the resistance, and (c) energy is being delivered by the battery?
At what rate would the current in a 100-mH inductor have to change to induce an emf of 100V in the inductor?
A 12 H inductor carries a current of 2.0 A.At what rate must the current be changed to produce a 60 V emf in the inductor?
The magnetic field in the region between the poles of an electromagnet is uniform at any time, but is increasing at the rate of 0.060 T/s. The area of the conducting loop in the field is 120cm^2, and the total circuit resistance, including the meter, is 6.0. What is the magnitude of the inductee emf?
A coil with an inductance of 2.6 H and a resistance of 8.2 Ω is suddenly connected to an ideal battery with ε = 110 V. At 0.14 s after the connection is made, what is the rate at which (a) energy is being stored in the magnetic field, (b) thermal energy is appearing in the resistance, and (c) energy is being delivered by the battery?
A single loop of wire with an area of 0.0920 m2 is in a uniform magnetic field that has an initial value of 3.80 T, is perpendicular to the plane of the loop, and is decreasing at a constant rate of 0.140 T/s. What emf is induced in this loop? If the loop has a resistance of 0.550 ohms, find the current induced in the loop.
At what speed must the sliding rod as shown move to produce an emf of 1.00 V in a 1.50 T field, given the rod’s length is 30.0 cm?
A 10 ohm resistance wire and a 0.5 H coil are connected in series between the ends of a generator with an electromotive force of E = 100sin40t. If the current intensity passing through the circuit at time t = 0 is "zero", what will be the current intensity at any time t?
Consider a conducting rod of length 32 cm moving along a pair of rails, and a magnetic field pointing perpendicular to the plane of the rails. At what speed (in m/s) must the sliding rod move to produce an emf of 0.95 V in a 1.75 T field?
At t = 0, a battery is connected to a series arrangement of a resistor and an inductor. At what multiple of the inductive time constant will the energy stored in the inductor’s magnetic field be 0.500 its steady-state value?