Ac generator class 12

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• Home • Latest NEW • Class 11 Menu Toggle • Mechanics Menu Toggle • Physical Quantities • Vectors • Kinematics • Laws of Motion • Work, Energy and Power • Circular Motion • Gravitation • Equilibrium • Elasticity • Class 12 Menu Toggle • Electricity And Magnetism Menu Toggle • DC Circuit • Heating Effect of Current • EMF of a Cell • Electrical Circuit • Thermoelectric Effect • Magnetic Effect of Current • Alternating Current • Magnetic Properties of Materials • Electromagnetic Induction • Rotational Dynamics • Simple Harmonic Motion Electromagnetic induction: The phenomenon in which an electromotive force will be set up on a coil due to relative motion between coil and magnet is known as electromagnetic induction. The electromotive force set up in the coil is known as induced emf and current due to the induced emf is known as induced current. Magnetic flux: The number of magnetic lines of force crossing through an area perpendicularly is known as magnetic flux. It is denoted by $\phi $. Mathematically, magnetic flux is defined as the scalar product of magnetic field intensity and area vector. (effective area). i.e. Magnetic flux ($\phi $) = $\overrightarrow$ or, $\phi $ = BA cos$\theta $ where $\theta $ is the angle between the direction of the magnetic field and normal to the plane of the conductor. If coil has N turns, then total magnetic flux, $\phi $ = NBA cos $\theta $ It’s unit is Tm 2 or weber (Wb) It is a scalar quantity. Special cases i. If $\theta $ = 0° We have,...

Two fixed strong permanent magnets are placed with their opposite poles facing each other. The magnetic field is concentrated to the coil by a structure of soft iron. A conductor coil of n turns rotates between the magnetic poles by the means of an external agent (Steam, running water, etc). The ends of the coils are connected to an external circuit through the means of carbon brushes and slip rings. AC generator works on the principle of Faraday's Laws of electromagnetic induction. According to it, when there is change of magnetic flux through a conductor loop, an emf is induced across the ends of the loop. The induced emf is such that it opposes the cause that induced it. It is given as negative of rate of change of magnetic flux through the circuit. The strong magnets create a magnetic field between the magnets directed from the north pole to the south pole. The coil is rotated by external means. As the coil rotates, the angle between the magnetic field and the coil changes which leads to the generation of an (alternating) induced emf. The ends of the coil is connected to an external circuit by the means of carbon brushes and slip rings. When the external circuit is closed, an alternating current flows through the coil and hence, electrical energy is supplied to the circuit.

More • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Explanation: 2 Marks Electric Generator works on the principle of electromagnetic induction which obeys Fleming’s Right Hand Rule. When coil is moved inside a magnetic field, the strength of field at the location of the arms of coil changes due to change of distance from the magnets and a current is induced in the coil. The electric current is thus generated by electric generator.

Two fixed strong permanent magnets are placed with their opposite poles facing each other. The magnetic field is concentrated to the coil by a structure of soft iron. A conductor coil of n turns rotates between the magnetic poles by the means of an external agent (Steam, running water, etc). The ends of the coils are connected to an external circuit through the means of carbon brushes and slip rings. AC generator works on the principle of Faraday's Laws of electromagnetic induction. According to it, when there is change of magnetic flux through a conductor loop, an emf is induced across the ends of the loop. The induced emf is such that it opposes the cause that induced it. It is given as negative of rate of change of magnetic flux through the circuit. The strong magnets create a magnetic field between the magnets directed from the north pole to the south pole. The coil is rotated by external means. As the coil rotates, the angle between the magnetic field and the coil changes which leads to the generation of an (alternating) induced emf. The ends of the coil is connected to an external circuit by the means of carbon brushes and slip rings. When the external circuit is closed, an alternating current flows through the coil and hence, electrical energy is supplied to the circuit.

More • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Explanation: 2 Marks Electric Generator works on the principle of electromagnetic induction which obeys Fleming’s Right Hand Rule. When coil is moved inside a magnetic field, the strength of field at the location of the arms of coil changes due to change of distance from the magnets and a current is induced in the coil. The electric current is thus generated by electric generator.

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• Home • Latest NEW • Class 11 Menu Toggle • Mechanics Menu Toggle • Physical Quantities • Vectors • Kinematics • Laws of Motion • Work, Energy and Power • Circular Motion • Gravitation • Equilibrium • Elasticity • Class 12 Menu Toggle • Electricity And Magnetism Menu Toggle • DC Circuit • Heating Effect of Current • EMF of a Cell • Electrical Circuit • Thermoelectric Effect • Magnetic Effect of Current • Alternating Current • Magnetic Properties of Materials • Electromagnetic Induction • Rotational Dynamics • Simple Harmonic Motion Electromagnetic induction: The phenomenon in which an electromotive force will be set up on a coil due to relative motion between coil and magnet is known as electromagnetic induction. The electromotive force set up in the coil is known as induced emf and current due to the induced emf is known as induced current. Magnetic flux: The number of magnetic lines of force crossing through an area perpendicularly is known as magnetic flux. It is denoted by $\phi $. Mathematically, magnetic flux is defined as the scalar product of magnetic field intensity and area vector. (effective area). i.e. Magnetic flux ($\phi $) = $\overrightarrow$ or, $\phi $ = BA cos$\theta $ where $\theta $ is the angle between the direction of the magnetic field and normal to the plane of the conductor. If coil has N turns, then total magnetic flux, $\phi $ = NBA cos $\theta $ It’s unit is Tm 2 or weber (Wb) It is a scalar quantity. Special cases i. If $\theta $ = 0° We have,...

More • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Explanation: 2 Marks Electric Generator works on the principle of electromagnetic induction which obeys Fleming’s Right Hand Rule. When coil is moved inside a magnetic field, the strength of field at the location of the arms of coil changes due to change of distance from the magnets and a current is induced in the coil. The electric current is thus generated by electric generator.

Two fixed strong permanent magnets are placed with their opposite poles facing each other. The magnetic field is concentrated to the coil by a structure of soft iron. A conductor coil of n turns rotates between the magnetic poles by the means of an external agent (Steam, running water, etc). The ends of the coils are connected to an external circuit through the means of carbon brushes and slip rings. AC generator works on the principle of Faraday's Laws of electromagnetic induction. According to it, when there is change of magnetic flux through a conductor loop, an emf is induced across the ends of the loop. The induced emf is such that it opposes the cause that induced it. It is given as negative of rate of change of magnetic flux through the circuit. The strong magnets create a magnetic field between the magnets directed from the north pole to the south pole. The coil is rotated by external means. As the coil rotates, the angle between the magnetic field and the coil changes which leads to the generation of an (alternating) induced emf. The ends of the coil is connected to an external circuit by the means of carbon brushes and slip rings. When the external circuit is closed, an alternating current flows through the coil and hence, electrical energy is supplied to the circuit.