Determine the total inductance and the circuit current of a 4-H inductor and a 6-H inductor series connected to a 400-Hz, 80-V supply. also determine the voltage across the 4-H inductor.

 

Hello,

Take a look at this page of the AAC eBook.
http://www.allaboutcircuits.com/vol_1/chpt_15/4.html

Greetings,
Bertus

 

If you have two inductors in series the total inductance is the sum of each of the inductors value. In your case is 6+4=10 H.

The impedance of the total inductance is:

XL=2*pi*f*L=2*pi*400*10=25.1K

Thus the current flowing will be:

I=V/XL=80/25.1K=3.2mA

The voltage across the 4H inductor:

XL4=2*pi*f*L=10K

thus

VL4=XL4*I=32V

 

sry i don't quite understand do you know the exact answer? pls.

 

The current flowing is 3.2mA and the voltage across the 4H inductor is 32V.

 

go to my other threads on this forum pls and see if you can answer them