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Electric generator generator#

Now, based on the need to induce \(AC\) or \(DC\) as well as the magnitude of the induced current to be obtained, we choose the type and size of the generator to be installed.

increasing the strength of the magnetic field.

increasing speed of rotation of the armature coil.

increasing the number of turns of its armature coil.

The magnitude of the induced emf in a generator can be increased by: Thus, in \(DC\) generator the induced current does not change its direction and hence is not alternating in nature rather it is direct in nature. So, the direction of induced current maintains its direction in the external circuit to be the anticlockwise direction. In \(DC\) generator, the ends of the armature coil change their connection with the ends of the external circuit with the help of split rings. Moreover, the magnitude of the induced current also varies due to the varying angle between the armature coil and the magnetic field lines. Hence, the induced current is alternating in nature. Thus, in the \(AC\) generator, we see that the direction of induced current changes in the external circuit after every half revolution of the armature coil. But now as the ends of the armature coil has maintained their connection with the same ends of the external circuit, the direction of the induced current in the external circuit will now be in a clockwise direction. By continuing the rotation in the same direction (anticlockwise), the now left arm which was the right arm earlier will move inwards and the other arm will move outwards.Īgain, by applying Fleming’s Right-Hand Rule, we find that the induced current in the armature coil is in the anticlockwise direction.

The frequency of \(AC\) in India is \(50\) the left arm of the armature coil will take the position of the right arm and vice versa. Thus, the \(AC\) generator produces \(AC\). \(AC\) Generator: The current produced by this type of electric generator changes continuously in magnitude and periodically in direction several times in a second. Based on this the electric generators are classified as:ġ. Types of Electric GeneratorĮlectric Generators produce \(AC\) as well \(DC\). Based on the type of current obtained from the electric generator, we have types of generators. Such a current is called alternating current \(AC\).īut when the current produced by the electric generator does not change in direction and magnitude then such a current is called direct current \(DC\). The induced current so obtained changes continuously in magnitude and periodically in direction several times in a second. In the electric generator, the coil is rotated in a magnetic field to get induced current. If the first finger points in the direction of the magnetic field, the thumb points in the direction of motion of the conductor, then the central finger points in the direction of induced current.” “Stretch the thumb, the first finger, and the central finger of the right hand so that they are mutually perpendicular to each other. The direction of the induced current so obtained in the coil can be found out using Fleming’s Right-Hand Rule that is as stated below: By changing the magnitude of the current in the conductor placed near the coil.

By the relative motion between a coil and a current carrying conductor.By the relative motion between a coil and a magnet.Various methods by which emf can be induced in a coil are as under: The magnitude of emf induced in a circuit is directly proportional to the rate of change of magnetic flux linked with the circuit.The induced emf lasts so long as the change in magnetic flux continues. Whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in the circuit.So, by relative motion between a coil and a magnet, we are changing the magnetic flux associated with the coil which in turn induces emf in the coil.įaraday formulated two laws that explain the phenomenon of electromagnetic induction. Magnetic flux is the total number of magnetic field lines passing through a particular area. Electromagnetic induction is the phenomenon of the generation of electric current in a circuit by changing the magnetic flux linked with the circuit. Electric Generator PrincipleĮlectric Generator works on the principle of electromagnetic induction. The emf is induced due to a phenomenon known as electromagnetic induction. The induced emf is responsible for the flow of induced current through the coil, routed to our houses. Mechanical energy is required to rotate the coil and convert it into electrical energy. When a coil is rotated in the magnetic field, or there is relative motion between a coil and a magnet, an electromotive force (emf) or potential difference is induced in the coil. The electricity being produced at various power stations is coming from the electric generator installed there. Electric Generator is a device that converts mechanical energy into electrical energy.