Hello,
I made inductor of thin(good) coper coil on iron drill bit but the inductor does not stop the AC going in the transformer of 12V 1Amp why?

 

Inductors do not 'block' AC. An inductor has a higher impedance to AC than it does to DC so it will reduce the AC current but it will not reduce it to zero.

 

Inductors do not 'block' AC. An inductor has a higher impedance to AC than it does to DC so it will reduce the AC current but it will not reduce it to zero.

Capacitor block DC And pass AC i have done practically.
But Inductor block AC i have studied in class.
ok, how to know the current will be reduced?
at what value??

 

If yo u have studied then you should now about inductive reactance.

 

Real capacitors are much nearer to being 'ideal' than are real inductors.

The impedance of an inductor is 2*PI*F*L where F is the frequency of the AC and L is the inductance.
How much that impedance reduces the AC current depends on the impedance of the source and load circuits

 

Hello,
How to calculate inductance of coil??

 

http://www.66pacific.com/calculators/coil_calc.aspx

 

does it will not depend in inductor material??

 

If the coil has a core then, yes, it depends on the core shape, size and permeability.
http://powerelectronics.com/content/inductor-core-material-heart-inductor

 

i was using transformer in series.

 

A transformer is two copper wire coils wrapped around a ferrous core.
You made an inductor out of copper wire wrapped around a ferrous core.
Why did you think it would block AC if the transformer didn't block it?

 

Maybe you need a low pass filter:

http://www.allaboutcircuits.com/textbook/alternating-current/chpt-8/low-pass-filters/

http://www.electronicshub.org/passive-low-pass-rc-filters/

 

Capacitors block DC and generate an impedance to AC proportional to the capacitor value and inversely proportional to the frequency.
Inductors pass DC and generate an impedance to AC proportional to both the inductor value and the frequency.
Inductors do not "block" AC.