What is the back emf induced in the windings at normal speed

Reference no: EM13543645

A dc motor is connected to a constant emf of 16.9 V. The resistance of its windings is 2.0 ?. At normal operating speed, the motor delivers 7.1 W of mechanical power. (a) What is the initial current drawn by the motor when it is first started up? (b) What current does it draw at normal operating speed? (c) What is the back emf induced in the windings at normal speed?

Reference no: EM13543645

Questions Cloud

What is the torque needed to reach the angular velocity : An athletic can twirl a baton so that it reaches an angular velocity of 12 rad/s from rest in 0.5 s. If the length of a uniform baton is 0.8 m and the mass is 0.5 kg, what is the torque needed to reach the angular velocity?

Calculate ratio of angular momentum of mars to that of earth : We would like to compare the angular momentum of Mars about its axis of rotation with that of Earth's. The mass of Mars is 11% that of Earth, with a radius 53% that of Earth, and a rotational period 103% that of Earth. Assuming both planets to be uni..

What is the normal force on the box : A person pushes on a stationary 125 N} box with 69N at 30degrees below the horizontal, as shown in the figure. The coefficient of static friction between the box and the horizontal floor is 1.20. What is the normal force on the box?

Find how far must the lens move to focus on second object : A photographer uses his camera, whose lens has a 40mm focal length, to focus on an object 5.0m away. How far must the lens move to focus on this second object

What is the back emf induced in the windings at normal speed : A dc motor is connected to a constant emf of 16.9 V. The resistance of its windings is 2.0 ?. At normal operating speed, the motor delivers 7.1 W of mechanical power. (a) What is the initial current drawn by the motor when it is first started up? (b)..

How is the magnitude of the torque acting on the dipole : An electric dipole p with magnitude 25 pC.m makes an angle of 65 ° with an electric field E of magnitude 3.0 x 10 ^ -6 N / C. How is the magnitude of the torque acting on the dipole?

Find what fraction of its kinetic energy is rotational : A yo-yo is made of two solid cylindrical disks, each of mass 0.049kg and diameter 0.074m , What fraction of its kinetic energy is rotational

What is the length of the tube : An organ tube is open at one end. A certain harmonic produced by the tube has a frequency of 450 Hz. The next higher harmonic has a frequency of 750 Hz. The speed of sound in air is 343 m/s. i. What is the integer n that describes the harmonic whose ..

Length of the string to double the period of the pendulum : A simple pendulum consists of a ball of mass M = 4.5 kg hanging from a uniform string of mass m = 0.6 g and unknown length L. The pendulum is located in gravitational field g = 9.8 m/s2 and has period T = 2 s. For simplicity, ignore the string’s weig..

User Account

All Pages