This website is using a security service to protect itself from online attacks. What is the fundamental significance of a transformer? The fundamental significance of a transformer is its ability to step voltage up or down from the powered coil to the unpowered coil. Whereas the familiar battery symbol is used as a generic symbol for any DC voltage source, the circle with the wavy line inside is the generic symbol for any AC voltage source. One might wonder why anyone would bother with such a thing as AC. It is true that in some cases AC holds no practical advantage over DC. However, with AC it is possible to build electric generators, motors and power distribution systems that are ac more efficient than DC, and so we find AC being used predominantly across the world in high power applications. To explain the details of why this is so, a bit of background knowledge about AC is necessary.
Notice how the polarity of the voltage across the wire coils reverses as the opposite poles of the rotating magnet pass by. Connected to a load, this reversing voltage polarity will create a reversing current direction in the circuit. The faster the alternator’s shaft is turned, the faster the magnet will spin, resulting in an alternating voltage and current that switches directions more often in a given amount of time. While DC generators work on the same general principle of electromagnetic induction, their construction is not as simple as their AC counterparts. 2 revolution, there are multiple sets of coils making intermittent contact with the brushes.
The diagram shown above is a bit more simplified than what you would see in real life. If the atmosphere surrounding the machine contains flammable or explosive vapors, the practical problems of spark-producing brush contacts are even greater. AC Motors The benefits of AC over DC with regard to generator design are also reflected in electric motors. While DC motors require the use of brushes to make electrical contact with moving coils of wire, AC motors do not. Transformers So we know that AC generators and AC motors tend to be simpler than DC generators and DC motors. This relative simplicity translates into greater reliability and lower manufacturing cost. But what else is AC good for?
Surely there must be more to it than design details of generators and motors! There is an effect of electromagnetism known as mutual induction, whereby two or more coils of wire placed so that the changing magnetic field created by one induces a voltage in the other. If we have two mutually inductive coils and we energize one coil with AC, we will create an AC voltage in the other coil. If the secondary coil is powering a load, the current through the secondary coil is just the opposite: primary coil current multiplied by the ratio of primary to secondary turns. Speed multiplication gear train steps torque down and speed up. Step-down transformer steps voltage down and current up.
Speed reduction gear train steps torque up and speed down. Step-up transformer steps voltage up and current down. The transformer’s ability to step AC voltage up or down with ease gives AC an advantage unmatched by DC in the realm of power distribution in figure below. Transformers enable efficient long distance high voltage transmission of electric energy. Transformer technology has made long-range electric power distribution practical. As useful as transformers are, they only work with AC, not DC. DC is not that different from AC.
Perhaps more than any other reason, this is why AC finds such widespread application in power systems. AC electromechanical generators, known as alternators, are of simpler construction than DC electromechanical generators. AC and DC motor design follows respective generator design principles very closely. A transformer is a pair of mutually-inductive coils used to convey AC power from one coil to the other. How Do I Prep My PCB for Fabrication? When Does a Pandemic Overstep Privacy? Воспользуйтесь нашей системой, чтобы проверить подлинность приобретенных товаров.
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