The generator’s electromotive force (EMF) is based on which of the following factors Increases the Electromotive force (EMF)Īnswer: 3) Increases the Electromotive force (EMF).Electromotive force (EMF) remains the same.Increasing the number of turns in the coil of an A.C generatorDecreases the Electromotive force (EMF) As a result, the flux across the coil is greatest when the current is zero. When the coil is horizontal, though, the current is greatest. The flux across the coil is at its highest in this position. When the coil is vertical, the current is zero. When the current is zero, what is the flux across the coil? generator is made up of a 50-turn coil with a 2.5 m 2 area rotating at 60 rad s -1 in a uniform magnetic field of 0.3 T between two fixed pole pieces. The magnetic flux is increased by using the soft iron core.

The armature is a rectangular coil made up of a large number of copper-wrapped turns wound around a soft iron core. generator, a ‘X’ is a rectangular coil made up of a large number of turns of copper wire coiled around a soft iron core. generator through electromagnetic induction. Mechanical energy is transferred to electrical energy in an a.c. generator through electromagnetic induction.Īn induced emf is produced across a coil when it is turned about an axis perpendicular to the direction of the uniform magnetic field. Electrical energy is transferred to mechanical energy in an a.c. Calculate the highest induced emf generated in the coil.Į o = nBAω. It rotates at a constant frequency of 140 Hz in a magnetic field of 0.15T. An armature coil is made up of 30 wire turns, each with an area of A = 0.05 m 2 and a total resistance of 10. When a coil is turned around an axis perpendicular to the uniform magnetic field’s direction, an induced emf is created across it and so current is generated. The principle of electromagnetic induction governs the operation of an a.c. Determine the principle that governs the operation of an a.c. What is the greatest voltage that the coil can generate?Į o = nBAω e o = nBA × (2πv) e o = 500 × 20.5 × 11 × 2π × 0.5 e o = 345035 V. The coil rotates at half a revolution per second and is immersed in a 20.5 T uniform magnetic field perpendicular to its axis of rotation.

Adithya rides a stationary bicycle with pedals attached to a 500 turn coil with an 11 m 2 area. The maximum current drawn = e o R = 720 500 Calculate the generator’s maximum current draw.Į o = nBAω e o = 100 × 0.04 × 3 × 60 e o = 720 V. generator is made up of a 1000-turn coil with a 3 m 2 cross-sectional area that rotates at 60 rad s -1 in a uniform magnetic field of 0.04 T. Calculate the maximum voltage that the coil can generate. It is positioned in a 0.01 T uniform magnetic field perpendicular to the coil’s rotation axis. At half a revolution per second, a 100-turn coil with a surface area of 0.1 m 2 turns. Cylindrical rotors are better suited to higher-speed alternators, such as those found in steam or nuclear power plants, which operate at roughly 3000 RPM. For medium-speed alternators, such as those found in hydropower facilities, salient pole or projected pole rotors are employed. The EMF created is determined by the strength of the magnetic field, the number of armature coil turns and the rotational field speed.Īlternators, often known as AC generators, are classed based on the rotor construction. Because obtaining induced alternating current from a fixed armature coil is easier than from one that is revolving, the standard approach is to maintain the coil stationary while rotating the magnetic field. This can be accomplished by rotating either a conducting coil in a static magnetic field or the magnetic field that contains the stationary conductor. Steam turbines, gas turbines and internal combustion engines typically provide the mechanical energy but, with the present emphasis in more sustainable electricity, wind, hydropower and tidal resources are becoming more plausible.įaraday’s law of electromagnetic induction states that an electromotive force (EMF or voltage) is generated in a conductor that cuts a uniform magnetic field. An alternating current sinusoidal output waveform is formed by an AC generator, which converts mechanical energy into electrical energy.

About us page generator FOR MCQS