Previous in Forum: heat   Next in Forum: Power and Speed Change with Respect to Voltage Drop
Close
Close
Close
2 comments
Participant

Join Date: May 2008
Posts: 2

Electrical Calculator Tool Online

05/09/2008 7:13 AM

I am using Capacitor Energy Time Constant formula at www.calculatoredge.com in the Electrical Section, I was wondering does any one have the physical formula for this, please advise

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Anonymous Poster
#1

Re: Electrical Calculator Tool Online

05/09/2008 8:08 AM

The energy "W" stored in a capacitor is equal to 1/2 times the capacitance "C" times the voltage "V" squared or W = 1/2 * C * V * V (Joules). The voltage across a capacitors terminals is equal to the stored charge "Q" divided by the capacitance "C" and the charge "Q" is equal to Current "I" multiplied by time "t". So with a little mathematical manipulation we can get...

the energy "W" in Joules is equal to "I" squared times "t" squared divided by 2 times the capacitance "C"

W = I * I * t * t / ( 2* C)

This can be manipulated in many ways for many applications.

Did this answer your question?

Register to Reply
Guru
Canada - Member - Our strength is our diversity

Join Date: Jan 2007
Location: Canada
Posts: 1024
Good Answers: 40
#2

Re: Electrical Calculator Tool Online

05/09/2008 10:10 AM

The Time constant (Tau) is simply the Load Resistance X Capacitance

Charge stored in a capacitor: Charge Q = CV where C is the capacitance in Farads

charge Q is measured in coulombs (C)

Energy stored in a capacitor: Energy stored, W = ½ QV = ½ CV2 joules

1 joule = 0.00094781712 btu

__________________
Perfection is a subjective and abstract concept.
Register to Reply
Register to Reply 2 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Previous in Forum: heat   Next in Forum: Power and Speed Change with Respect to Voltage Drop

Advertisement