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level: Electromagnetic induction (HARD)

Questions and Answers List

level questions: Electromagnetic induction (HARD)

QuestionAnswer
The process of generating a potential difference (voltage) across a conductor by moving it at right-angles to a magnetic field or by moving a magnet into a coil of wire.Electromagnetic Induction
What is needed for an electric current to flow in a conductor?A potential difference (voltage) is needed for an electric current to flow in a conductor.
The phenomenon of inducing a potential difference (voltage) in a conductor when it is moved in a magnetic field or when a magnet is moved into a coil of wire.Generator Effect
What are the two main methods of inducing a potential difference in a conductor?The two main methods are moving a conductor at right-angles to a magnetic field and moving a magnet into a coil of wire.
A wire or coil that is in motion, perpendicular to a magnetic field.Moving Conductor
What happens when a conductor is moved at right-angles to a magnetic field?A potential difference is induced across the conductor, leading to the flow of an electric current.
A closed pathway that allows the flow of an electric current.Complete Circuit
What is required for electromagnetic induction to produce a current?Electromagnetic induction produces a current if the conductor is part of a complete circuit.
A winding or loop of wire used in electromagnetic induction.Coil of Wire
How does moving a magnet into a coil of wire induce a potential difference?The changing magnetic field, caused by moving a magnet into a coil of wire, induces a potential difference in the coil, leading to the generation of a current.
The voltage or electrical pressure that drives the flow of an electric current in a circuit.Potential Difference
What is the role of potential difference in electromagnetic induction?Potential difference is essential for inducing a current in a conductor through electromagnetic induction.
The orientation of the moving conductor concerning the magnetic field, which enhances electromagnetic induction.Right-Angles to Magnetic Field
Why is moving a conductor at right-angles to a magnetic field effective in inducing a potential difference?Moving a conductor at right-angles to a magnetic field maximizes the induction of a potential difference, leading to the generation of a current.
The process of inducing an electromotive force (EMF) or voltage in a conductor by changing the magnetic field around it.Electromagnetic Induction
How is electromagnetic induction used to generate electricity in the laboratory?In the laboratory, a coil of wire is spun between two magnets using a handle. The changing magnetic field induces a small amount of electricity in the coil.
A device that converts mechanical energy into electrical energy by electromagnetic induction.Generator
What is the purpose of a generator in the context of electromagnetic induction?A generator utilizes electromagnetic induction to convert mechanical energy (from steam, water, or wind) into electrical energy on a larger scale.
A device that captures energy from a moving fluid (liquid or gas) and converts it into mechanical energy.Turbine
How is a turbine connected to a generator in power stations?In power stations, a turbine, turned by steam, water, or wind, is connected to a generator to produce electrical energy through electromagnetic induction.
The voltage or electrical potential difference induced in a conductor by a changing magnetic field.Electromotive Force (EMF)
What is induced in the coil of a generator during electromagnetic induction?Electromotive force (EMF) is induced in the coil of a generator, resulting in the generation of electrical energy.
The generation of electricity on a significant scale, typically in power stations, using processes like steam, water, or wind to turn turbines connected to generators.Large-Scale Electricity Generation
How is electromagnetic induction employed for large-scale electricity generation in power stations?In power stations, electromagnetic induction is used on a large scale by connecting a turbine (turned by steam, water, or wind) to a generator with a large coil of wire and magnets. The rotating coil generates electrical energy through induction.
A device that uses the generator effect to produce an alternating current (a.c.) by rotating a coil of wire in a magnetic field.Alternator
What is the function of an alternator?An alternator generates an alternating current by utilizing the generator effect, achieved through the rotation of a coil of wire in a magnetic field.
The process by which a potential difference (voltage) is induced in a conductor when it moves through a magnetic field.Generator Effect
How does an alternator create an alternating current?An alternator creates an alternating current by rotating a coil of wire in a magnetic field, inducing a changing potential difference in the coil.
A winding of wire forming a coil, typically used in generators and alternators.Coil of Wire (solenoid)
What rotates in an alternator to induce a potential difference?A coil of wire rotates in an alternator to induce a potential difference.
Conductive rings connected to the coil in an alternator, allowing the current to pass to the external circuit.Slip Rings
What is the purpose of slip rings in an alternator?Slip rings enable the current generated in the rotating coil to pass to the external circuit in an alternator.
An electric current that periodically reverses direction, changing its polarity.Alternating Current (A.C.)
What type of current does an alternator produce?Alternators produce an alternating current (a.c.).
The voltage produced in a conductor due to the generator effect, resulting from its motion in a magnetic field.Induced Potential Difference
How is an induced potential difference created in an alternator?An induced potential difference is created in an alternator as the coil of wire rotates in the magnetic field, generating changing voltages.
A visual depiction, often in the form of a graph, illustrating the relationship between variables or parameters.Graph Representation
What does the graph in alternators illustrate about potential difference in the coil?The graph illustrates that the potential difference in the coil is greatest when the coil is horizontal and zero when the coil is vertical.
A device that employs the generator effect to produce a direct current (d.c.) by rotating a coil of wire in a magnetic field.Dynamo
What is the primary function of a dynamo?A dynamo is designed to generate a direct current by utilizing the generator effect through the rotation of a coil of wire in a magnetic field.
A device in a dynamo that consists of two half rings of conducting material, allowing the current to flow in the same direction while the coil rotates.Split Ring Commutator
How does a split ring commutator differ from slip rings in a dynamo?Unlike slip rings, a split ring commutator in a dynamo allows the current to flow in the same direction, ensuring a unidirectional flow in the external circuit.
A rotary switch or device in a dynamo that reverses the direction of current flow in the coil, maintaining a unidirectional current in the external circuit.Commutator
What is the role of the commutator in a dynamo?The commutator in a dynamo reverses the direction of current flow in the coil, ensuring a continuous unidirectional current in the external circuit.
An electric current that flows in one direction, maintaining a constant polarity.Direct Current (D.C.)
What type of current does a dynamo produce?Dynamos produce a direct current (d.c.).
A visual depiction, often in the form of a graph, illustrating the relationship between variables or parameters.Graph Representation
How is the unidirectional flow of current represented in the graph for dynamos?The graph illustrates the consistent unidirectional flow of current due to the use of a split ring commutator.
A device that utilizes the generator effect to transform sound waves into electrical signals, converting variations in pressure into variations in electrical current.Microphone
What is the primary function of a microphone in the context of the generator effect?A microphone serves to convert sound waves into electrical signals by employing the generator effect.
The phenomenon where a changing magnetic field induces an electromotive force (EMF) or voltage in a conductor, leading to the generation of an electrical current.Generator Effect
How does a microphone use the generator effect to convert sound waves into electrical signals?When sound waves impact the diaphragm of a microphone, the diaphragm vibrates, causing a coil to move within a magnetic field. This movement generates a current through the generator effect.
A thin membrane in a microphone that vibrates in response to sound waves, transmitting the vibrations to other components.Diaphragm
What role does the diaphragm play in the microphone's operation?The diaphragm, when struck by sound waves, vibrates to mimic the frequency and amplitude of the sound, initiating the process of converting sound into electrical signals.
A component in a microphone that moves within a magnetic field, generating an electric current as a result of the generator effect.Coil
How does the coil contribute to the generation of electrical current in a microphone?The coil, set in motion by the vibrations from the diaphragm within a magnetic field, induces an electric current through the generator effect.
The voltage or electrical potential difference induced in a conductor when exposed to a changing magnetic field, as described by the generator effect.Electromotive Force (EMF)
What is the significance of electromotive force in the operation of a microphone?The induced electromotive force, resulting from the movement of the coil in the magnetic field, leads to the generation of an electrical current in the microphone.
The region around a magnet or current-carrying conductor where magnetic forces are exerted on other magnets or conductors.Magnetic Field
How does the interaction with a magnetic field contribute to the generator effect in a microphone?The movement of the coil within the magnetic field is crucial for the generator effect, inducing current in the microphone.
A closed path or loop through which an electric current can flow, comprising various components such as resistors, coils, and capacitors.Electrical Circuit
What is the ultimate outcome of the generator effect in a microphone within an electrical circuit?The generator effect results in the generation of electrical current, representing the converted electrical signals, which can then be processed within an electrical circuit.
A device that converts electrical signals into sound waves, utilizing the motor effect to produce vibrations in a cone or diaphragm, leading to the creation of sound.Loudspeaker
What is the primary function of a loudspeaker, and what effect does it employ to produce sound?A loudspeaker transforms electrical signals into sound waves by using the motor effect. It generates vibrations in a cone or diaphragm, resulting in the production of sound.
The phenomenon where a current-carrying conductor in a magnetic field experiences a force, leading to mechanical movement or vibration.Motor Effect
How does the motor effect contribute to the operation of loudspeakers and headphones?In loudspeakers and headphones, an alternating current induces an electromagnetic field in a coil. The interaction between this field and a permanent magnet generates a force, causing the cone or diaphragm to vibrate and produce sound.
An electric current that reverses direction periodically, commonly used to transmit electrical energy.Alternating Current (AC)
What type of current is sent through the coil in loudspeakers and headphones, and why is it essential for their operation?An alternating current is sent through the coil. The constant change in direction of this current contributes to the vibrations of the cone or diaphragm, producing sound.
A wire or conductor wound into a spiral or loop, often used in electromagnetic devices.Coil (solenoid)
How does the coil in loudspeakers and headphones play a role in generating sound?The coil, when subjected to an alternating current, generates an electromagnetic field, initiating the motor effect and leading to mechanical movement in the cone or diaphragm.
A region around a conductor or coil where magnetic forces are exerted when an electric current is present.Electromagnetic Field
What role does the electromagnetic field play in the motor effect within loudspeakers and headphones?The alternating current in the coil produces an electromagnetic field that interacts with a permanent magnet, generating a force that drives the vibration of the cone or diaphragm.
A cone-shaped component in a loudspeaker or headphone that vibrates in response to the motor effect, producing sound waves.Cone
How does the movement of the cone contribute to the creation of sound in loudspeakers and headphones?The vibrations of the cone, induced by the motor effect, create variations in air pressure, resulting in the production of sound waves.
A thin membrane or sheet in a loudspeaker or headphone that vibrates to generate sound.Diaphragm
Besides a cone, what other component might be used in loudspeakers and headphones to convert electrical signals into sound waves?In addition to a cone, a diaphragm is another component that can be used to vibrate and generate sound in loudspeakers and headphones.