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How does an AC generator reverse the direction of flow?
An electric generator consists of a magnet and a loop of wire which rotates in the magnetic field of the magnet. Then as the loop rotates through 180 degrees the force reverses to give an electric current in the opposite direction along the wire.
How does an AC generator work and on what principle?
AC generators work on the principle of Faraday’s law of electromagnetic induction. This law states that electro motive force is generated in a current carrying loop that is placed in a uniform magnetic field. When the coil in the generator starts moving, the arm AB starts moving upwards and the arm CD moves downwards.
In which direction does the wire tend to move if the current flows from A to B?
If current flows in the wire as shown, in which direction does the wire tend to move? Ans. The direction of magnetic field is from N-pole to S-pole; on applying Fleming’s left-hand rule, the wire tends to move perpendicular to plane of paper upward.
Is commutator present in AC generator?
No commutator is present in AC Generator. To make the current flow in one direction only, DC Generator comprises the commutator.
How do you reverse the direction of current?
Of course, the direction of current is controlled by the polarity of the voltage. So in order to change the direction of rotation, we can simply reverse the voltage, causing the current to flow in the opposite direction, changing the force by 180 degrees and the motor to be driven ‘backwards’.
Why does AC change polarity?
In an alternator, a loop of wire is spun rapidly inside of a magnetic field. This produces an electric current along the wire. This current can change direction periodically, and the voltage in an AC circuit also periodically reverses because the current changes direction.
Which one is not present in AC generator?
The general A.C. generator has all the listed components except the commutator.
What is B in F qvB?
The magnetic field B is defined from the Lorentz Force Law, and specifically from the magnetic force on a moving charge: The magnitude of the force is F = qvB sinθ where θ is the angle < 180 degrees between the velocity and the magnetic field.
How does current affect magnetic field?
Current is directly proportional to magnetic force for a straight current carrying conductor in a uniform magnetic field. So the force is directly proportional to the size of the current. If the current is increased by five times the force will also increase by five times.