In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Question

Want to see more full solutions like this?

Answer 1

Textbook Question

Chapter 30, Problem 30.1DQ

In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

03:05

Students have asked these similar questions

Statistical thermodynamics. The number of imaginary replicas of a system of N particlesa) cannot be greater than Avogadro's numberb) must always be greater than Avogadro's number.c) has no relation to Avogadro's number.

Lab-Based Section Use the following information to answer the lab based scenario. A student performed an experiment in an attempt to determine the index of refraction of glass. The student used a laser and a protractor to measure a variety of angles of incidence and refraction through a semi-circular glass prism. The design of the experiment and the student's results are shown below. Angle of Incidence (°) Angle of Refraction (º) 20 11 30 19 40 26 50 31 60 36 70 38 2a) By hand (i.e., without using computer software), create a linear graph on graph paper using the student's data. Note: You will have to manipulate the data in order to achieve a linear function. 2b) Graphically determine the index of refraction of the semi-circular glass prism, rounding your answer to the nearest hundredth.

Use the following information to answer the next two questions. A laser is directed at a prism made of zircon (n = 1.92) at an incident angle of 35.0°, as shown in the diagram. 3a) Determine the critical angle of zircon. 35.0° 70° 55 55° 3b) Determine the angle of refraction when the laser beam leaves the prism.

Answer 2

Textbook Question

Chapter 30, Problem 30.1DQ

In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

03:05

Answer 3

Textbook Question

Chapter 30, Problem 30.1DQ

In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

03:05

Answer 4

Textbook Question

Chapter 30, Problem 30.1DQ

In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant electric spark is often seen when the attachment crosses a junction in the wires where contact is momentarily lost. Explain this phenomenon.

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

03:05

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Answer 8

Expert Solution & Answer

To determine

the phenomenon used in electric trolley system.

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

To determine

the phenomenon used in electric trolley system.

Answer 12

Explanation of Solution

The key terms explaining the electric trolley system is generation of standing waves and the back emf of the trolley motor.

In the above mentioned electric bus system the vehicle’s motor draws current from a single wire connection. The return current runs through the steel rails of the track.

As the train moves, the contact shoes (long arm) slides along the wire and this leads to generation of standing waves in the over head wires.

The standing waves occur because the medium (bus) is moving in the opposite direction to the wave. It can also rise due to interference between two waves travelling in opposite directions. These waves are reflected back and forth in the electric line.

With respect to Sparking, it occurs when there is loss of contact or improper contact between the long arm of the bus and the contact wire of the system. The under-lying mechanism is that it is due to the "back EMF" (reverse voltage) from the trolley motor, when contact is interrupted. That is this emf opposes the change in current which had earlier induced it. This concept is resourced from Lenz law.

Conclusion:

Thus, the mechanism of electric trolley system is explained.