In Northern Ireland, large scale a. Antrim, which is then transmitted across country to consumers. The coil of these generators rotates 50 times a second and that is why our mains supply is 50 Hz a. Electromagnetic induction occurs when an electric current passes through a shifting magnetic field, which allows mechanical energy to be converted into electrical energy.
This is the main way generators produce electricity. AC and DC power generators both use electromagnetic induction to generate electricity. However, the process they use is different. An AC generator creates an alternating current that periodically reverses direction.
But in a DC generator, a direct current flows in one direction. In an AC generator, the coil through which current flows is fixed, and the magnet usually moves. The south and north poles of the magnet make the current flow in opposite directions, thereby creating an alternating current. In contrast, the coil in a DC generator is not fixed; rather, it rotates in a fixed field. The two ends of the coil are attached to the commutator, which balances the charges to and from the generator , thus resulting in a current that does not alter direction.
Rather, they convert a different form of energy into electrical energy. This form of electrical generation is used with all sources of energy that use the movement of a turbine. Examples of these include hydropower , fossil fuel -based power, nuclear energy , and solar thermal power plants , among others. Almost all major power plants generate alternating current , as do diesel generators. Faraday's Law states that a changing magnetic flux on a looped conductor will produce a magnetic force that causes the electrons in the conductor to move, creating a current.
This is known as electromagnetic induction , and it is the fundamental principle underlying many generators.
The magnetic force applied to the electrons creates a voltage in the conductor that is known as an electromotive force. The strength and direction of the electromotive force is determined by the strength and direction of the magnetic field and the velocity of either the magnet or the conductor [2]. Electric motors work in the exact opposite way— electric current in a magnetic field creates motion.
Electric current is generated when a rotating loop of wire, known as an armature, is placed in a uniform magnetic field , or when a stationary armature is placed in a rotating magnetic field. In the first case, as the armature rotates, one half of the loop will always be moving in the opposite direction of the other half of the loop. Here, the induced potential difference is in the opposite direction to what it was at B.
The ac generator An alternating current ac generator is a device that produces a potential difference. The alternator The diagram shows a simple alternator. Slip rings maintain constant contact with the same sides of the coil As one side of the coil moves up through the magnetic field, a potential difference is induced created in one direction.
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