Close
Login to Your Account
Faadooengineers

Results 1 to 4 of 4

Thread: Need help with this question of AC circuit..urgent?

  1. #1

    Need help with this question of AC circuit..urgent?

    a potential difference of 200 /__ 30 deg is applied to two circuits connected in parallel. the current in the respective branches are 20 /__ 60 deg and 40 /__ 3 deg. Find:

    1) Active power consumed by each branch and whole circuit
    2) Reactive power in each branch and in the whole circuit

    Additional Details
    i thought it would b solved in the following way. is it correct?
    since power =VI



    for active power in branch 1
    I=I(1) cos 60
    V= v cos 30

    for reactive power in branch 1
    I= I (1) sin 60
    V=v sin 30

    for total active power
    I=i(1)cos60+i(2)cos3
    V=vcos 30



  2. #2

    Re: Need help with this question of AC circuit..urgent?

    The KVA of the first branch is KVA=E*I =(200 * 20) / 1000 = 4 KVA
    The power factor is the cosine of 60 degrees = 0.5
    The KW of this branch is KW=KVA*PF = 4 * 0.5 =2KW
    The reactive power in the first branch is KVAR=Tan60degrees*2 = 1.732*2 = 3.464 KVAR

    The KVA of the second branch is KVA=E*I =(200 * 40) / 1000 = 8 KVA
    The power factor is the cosine of 3 degrees =0.998629535
    The KW of this branch is KW=KVA*PF = 8 * 0.998629535 =7.989 KW
    The reactive power in the second branch is KVAR=Tan3degrees*7.989 = 0.0524*7.989 = 0.4186 KVAR

    The total power consumed in whole circuit is 2 = 7.989 = 9.989 KW
    The KVAR of the whole circuit is 3.464 + 0.4186 = 3.8826 KVAR

    I wonder if the phase angle in branch 2 was 3 or 30 degrees. I worked it as 3 degrees.

  3. #3

    Re: Need help with this question of AC circuit..urgent?

    girls are always intelligent.... congrats saloni.....

  4. #4

    Re: Need help with this question of AC circuit..urgent?

    Thanks saloni for helping out...keep it up..
    Vrishti Singh

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Share anywhere and get download.

50%