i want what does a transformer exactly do and not how it works
A transformer is used to increase or decrease voltage, but only for alternating current. It won't work with direct current. When a current alternates in a current carrying conductor a magnetic field expands and collapses, changes polarity and expands and collapses again. It then repeats the process for each cycle of the alternating current. If you have another current carrying conductor within this changing magnetic field, then another current is induced into that conductor as a result of the magnetic field cutting the conductor. This is called induction. So an alternating current in one conductor can induce a current in an adjacent conductor. In a transformer we have two coils, the primary and the secondary. If we have twice as many turns in the secondary to the primary we have a step up transformer - it steps up according to the ratio of turns between the two coils. Here the ratio oi 2:1 so the voltage is increased by 2.
Transformer is used to step up or step down an AC. Its consist of two winding, that is primary winding and secondary winding.Its operation depends on electromagnetic induction between two stationary coils and a magnetic flux of changing magnitude and “polarity . Below is the link, that got further explanation. Hope it can help u. :-)
