# Help needed on this QUESTION....!!!

Discussion in 'Homework Help' started by Ladies_Man, Jul 30, 2007.

Jul 28, 2007
4
0
A current of 1mA (rms) is flowing through a 0.00047microF capacitor.
If the frequency of the applied voltage across the capacitor is 10kHz, calculate the (a) the voltage, (b) true power and (c) the reactive power of the capacitor....

If u don't mind, show me all the steps in details...

THANKS....

2. ### Dave Retired Moderator

Nov 17, 2003
6,960
144

We can help, but we are not just going to give you the answer without any input on your part.

This also looks like a homework question, therefore will be moved to the appropriate forum.

Dave

3. ### recca02 Senior Member

Apr 2, 2007
1,211
0
is that the complete data?
to calculate active and reactive power u need the resistance offered to the current. if capacitor is an ideal one power is purely reactive.
z= impedance ,
v= voltage,
i=current,
r=resistance,
Xc= capacitive reactance,
z= sqrt(r^2 + Xc^2 )
V=i*z.
power (apparent) = V.I
power (apparent)^2 = reactive power ^2 + active power^2
(there are other ways to get it as well use impedance triangle and find power factor)
reactive power= VIsin(phi)
active power = VIcos(phi)
active power = I^2.R