×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Capacitance calculation

Capacitance calculation

Capacitance calculation

(OP)
What is the equation for obtaining capacitance from volts and time etc. We haven't a meter to read our caps, so need a relible way to do so in a hurry?

RE: Capacitance calculation

   Capacitance C(farads) can easily be determined in A.C. by measuring voltage V(volts) and current I(amperes) at a frequency f(Hertz). The formula is:
             C = I/(Vx2xpixf)
   For instance: 2 A at 240 V and 60 Hz give a capacitance of:
             C = 2/(240x2xpix60) = 22'1 microfarads.

Julian

RE: Capacitance calculation

You should not perform the measurement method 230842 describes with line voltage. Line voltage contains a significant amount of harmonics  which may give a reading of 50% more current for a given capacitance.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources