When an electric motor is attached to a power supply, the motor turns. What happens if...
When an electric motor is attached to a power supply, the motor turns. What happens if the electric motor is turned by means of some external action (such as by a handle that is attached to the axle of the motor)?
Homework Answers
Electric motor is used to convert electrical energy into mechanical energy and the generator produces electrical energy from mechanical energy.
The basic principle of Motor: a current carrying loop in a magnetic field experiences a torque
The basic principle of Generator: An emf is induced in a closed loop when magnetic flux through the coil changes
In principle, if the electric motor is turned by means of some external action, the motor act as a generator of electricity. DC motor with permanent magnets can act as a generator whether it is brushed or not; you will need to add a rectifier to get a DC output.
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When an electric motor is attached to a power supply, the motor
turns. What happens if...
Question 13 5 pts An electric motor delivers 67-HP mechanical power when its shaft turns at...
Question 13 5 pts An electric motor delivers 67-HP mechanical power when its shaft turns at 2,832 RPM. What is the shaft torque in N.m? 1 HP = 746 W. Question 14 5 pts Copy of A DC motor supplied from 48 V draws 5 amps and turns at 157 rad/sec when the load torque is 1.45 N.m. What is the efficiency in percent?
An electric motor turns a llywheel through a drive belt that joins a pulley on the...
An electric motor turns a llywheel through a drive belt that joins a pulley on the motor and a pulley that is rigidly attached to the flywheel as shown in the figure below. The flywheel is a solid disk with a mass of 53.0 kg and a radius R -0.625 m. It turns on a frictionless axle. Its pulley has much smaller mass and a radius of 0.230 m. The tersion in the upper (taut) segment of the belt is...
The rotor in a certain electric motor is a flat, rectangular coil with 89 turns of...
The rotor in a certain electric motor is a flat, rectangular coil with 89 turns of wire and dimensions 2.41 cm by 4.04 cm. The rotor rotates in a uniform magnetic field of 0.800 T. When the plane of the rotor is perpendicular to the direction of the magnetic field, the rotor carries a current of 10.9 mA. In this orientation, the magnetic moment of the rotor is directed opposite the magnetic field. The rotor then turns through one-half revolution....
dc electric motor consumes 36 MJ when connected to a 250 V supply for 1 hour...
dc electric motor consumes 36 MJ when connected to a
250 V supply for 1 hour . Find the power rating of the motor * .and
the current taken from the supply
Q3/1/ Some copper wire has a resistance of 200 Ohm at 20.C.A current is passed through the wire and the temperature rises to 90°C. Determine the resistance of the wire at 90-C, assuming that the temperature coefficient of resistance * .is 0.004/-C at 0 C 251.85 Ohm O...
Q1// A dc electric motor consumes 36 MJ when connected to a 250 V supply for...
Q1// A dc electric motor consumes 36 MJ when connected to a 250 V supply for 1 hour. Find the power rating of the motor and the current * .taken from the supply 10 kw, 40 A O 12 kw, 15 A O 40 kw, 10 A O 15 kw, 30 A O 20 kw, 13 A None of the above It needs a solution in 10 minutes
answer Q1/A dc electric motor consumes 36 MJ when connected to a 250 V supply for...
answer
Q1/A dc electric motor consumes 36 MJ when connected to a 250 V supply for 1 hour. Find the power rating of the motor and the current taken from the supply 15 kw, 30 A O 40 kw, 10 A O 20 kw, 13 A O 12 kw, 15 A O 10 kw, 40 A O None of the above
The coil of the electric motor shown in (Figure 1) has 100 turns and an area...
The coil of the electric motor shown in (Figure 1) has 100 turns and an area of 0.015 m2. Its rotation axis is attached to a pulley with a radius of 3.5 cm. At the moment shown, the plane of the coil is parallel to the 0.39 T magnetic field. A)What current in the coil will hold the 1.0 kg weight in equilibrium?
1. An electric motor draws 2238 watts and 12 amperes when oper ating on a 240 volt 60 hertz source. Calculate: a. Power factor of motor b. Power input to motor c. Horespower output of the motor if it is 75% efficient.
1. An electric motor draws 2238 watts and 12 amperes when oper ating on a 240 volt 60 hertz source. Calculate: a. Power factor of motor b. Power input to motor c. Horespower output of the motor if it is 75% efficient. (Question no 4)
A dc series excited motor is connected to 230V power supply. The resistance of the armature...
A dc series excited motor is connected to 230V power supply. The resistance of the armature winding is 0.25 ohms and the series winding resistance is 0.15 ohms. At 1100 rpm the motor consumes 50A. Calculate the speed of the motor when connected to a 200V power supply. Assume that the motor shaft torque is unchanged.
What happens to the price and quantity of petrol in the market when electric cars become...
What happens to the price and quantity of petrol in the market when electric cars become more popular? Explain AND draw supply and demand curves to support your answer.
Question 13 5 pts An electric motor delivers 67-HP mechanical power when its shaft turns at 2,832 RPM. What is the shaft torque in N.m? 1 HP = 746 W. Question 14 5 pts Copy of A DC motor supplied from 48 V draws 5 amps and turns at 157 rad/sec when the load torque is 1.45 N.m. What is the efficiency in percent?
An electric motor turns a llywheel through a drive belt that joins a pulley on the motor and a pulley that is rigidly attached to the flywheel as shown in the figure below. The flywheel is a solid disk with a mass of 53.0 kg and a radius R -0.625 m. It turns on a frictionless axle. Its pulley has much smaller mass and a radius of 0.230 m. The tersion in the upper (taut) segment of the belt is...
The rotor in a certain electric motor is a flat, rectangular coil with 89 turns of wire and dimensions 2.41 cm by 4.04 cm. The rotor rotates in a uniform magnetic field of 0.800 T. When the plane of the rotor is perpendicular to the direction of the magnetic field, the rotor carries a current of 10.9 mA. In this orientation, the magnetic moment of the rotor is directed opposite the magnetic field. The rotor then turns through one-half revolution....
dc electric motor consumes 36 MJ when connected to a
250 V supply for 1 hour . Find the power rating of the motor * .and
the current taken from the supply
Q3/1/ Some copper wire has a resistance of 200 Ohm at 20.C.A current is passed through the wire and the temperature rises to 90°C. Determine the resistance of the wire at 90-C, assuming that the temperature coefficient of resistance * .is 0.004/-C at 0 C 251.85 Ohm O...
answer
Q1/A dc electric motor consumes 36 MJ when connected to a 250 V supply for 1 hour. Find the power rating of the motor and the current taken from the supply 15 kw, 30 A O 40 kw, 10 A O 20 kw, 13 A O 12 kw, 15 A O 10 kw, 40 A O None of the above
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