Today topic is,
I have shown 2 circuits.
In this circuit, there is only 1 resistor.
In this circuit,
resistor & inductor both are there.
When we close the switch,
Battery voltage will come here,
Suppose we are closing switch here,
Then voltage will go like this.
And current also will flow immediatly.
This is current I1.
And the current will be equal to V/R
Suppose this is 10 volt.
This is 10 ohm.
Then 10/10, 1 A current will flow.
But, If inductor also is connected,
Then because of inductor,
When we close the switch here,
current will not flow immediatll,
This current is here.
This current is here.
Current will rise slowly.
And after some time,
It will be full value equal to V/R
Means, if it is 10 V battery voltage,
10 ohm resistor value,
And 10/10, 1 amp will come.
Now here I have shown 1 transformer.
This has no load,
connected in the secondry.
When we apply primary voltage,
Because of primary voltage,
current will flow.
No current will flow here.
Here current will flow.
This current is this.
Because of current,
flux will flow in the core.
Flux flows because,
current is flowing.
Suppose,
There are so many turns,
and it has resistance also.
Even you apply voltage,
Current will be very less or will not flow,
then flux will not generate.
For flux current is required.
So because of voltage,
1st current flows
in the primary.
Then flux is generated
in the core.
And if flux is changing with time,
Then voltage is generated in the secondry.
This voltage can generate,
without any current in secondry.
So 1st voltage is applied,
then current is generated,
then current produces flux.
And change in flux,
produces secondry voltage.
