What changes will (of voltage, current, energy, power, etc) happen to the Primary coil, if an AC supply given to the primary coil, but;
- Secondary coil circuit is turned OFF (Open),
- Secondary coil circuit is turne ON (closed), with a High, but finite- resistance load, and
- Secondary coil is turned ON (closed) with a LOW resistance load;
in case of A. Step Up transformer, B. Step Down transformer.
Please also explain, how Lenz's law is applicable in case of these 2 types of transformers, Lenz's law states the induced current will try to hinder the cause.
But so-far I know (may be correct or incorrect), in a transformer, when there's supply to primary-coil , but the secondary coil-circuit is open (off), (that means , no current on secondary coil) there's little flow in the primary coil, but when the secondary coil-circuit is turned-ON (that means, current flowing through secondary coil), the current on primary coil increases.
& That means current on primary coil, not at-all hindering the source, rather enhancing the source current.
And this seems very much contradictory with Lenz's law.
How a transformer then obey Lenz's law? if not, then why?