Transformer works on the principle of Electromagnetic induction.
The working of a transformer depends on the Faraday Law of Electromagnetic Induction.
A transformer is a device to convert high voltage AC to low voltage AC & vice-versa. It works on the principle of induction. Since induction occurs only in an AC supply, a transformer cannot work on DC.. So, it is not possible to convert DC supply to AC using transformer. You would need an inverter to convert DC to AC.
Trsansformers work on mutual induction principle caused by the changing magnetic field. Since there is no changing magnetic field i.e there is no "+" and "-" cycle in DC source supply so transformer cant work on a DC source. Its core will become permanent magnet.
An induction motor works on the principle of electromagnetic induction. When an alternating current flows through the stator windings, it creates a rotating magnetic field. This magnetic field induces a current in the rotor windings, causing it to rotate and drive the attached load.
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Electromagnetic induction is the production of voltage across a conductor moving through a magnetic field. It underlies the operation ofgenerators, all electric motors, transformers, induction motors, synchronous motors, solenoids, and most other electrical machines.Also the metal detectors work on the principle of electromagnetic induction.
There are more than one electrical components that work through induction. Two examples are motors and transformers.
Transformers only work on ac supply because it principle is mutual induction. DC supply has constant magnitude whereas AC has alternating magnitude. so we can step up or step down current/voltage in transformer in ac only.
becoz alternater has work on principle of electomagnetic induction .
Primary and secondary winding and mutual induction principle.
Some types of dc (direct current) motor can be used to generate dc, in which case they are often called 'dynamos'. Some alternating current (ac) motors can be used to generate ac, in which case they are called 'alternators', but many types will only work as motors. For instance, a squirrel cage ac motor cannot be used as an alternator.