I'm not sure how to conclude the ESR of the capacitor from its spesifications.
what i did is:
R = 1 / [tan(delta) * 2PI * 120(Hz) * Cap(F)]
For a 350V rated, 330uF capacitor, it turned out that R = 16ohm, which is not reasonable.
By the way, voltage rating's units arent Vrms? why do they call it WVDC?
Yeah, that's was the wrong formula, use mine. Should get 1 ohm... ugh, is this a homework problem? I'm always suspicious of magic numbers like that.
They call it WVDC because the capacitance changes (slightly) when it gets charged, so that's Working Voltage DC. It changes because the charge on the plates exert a compressive force on the dielectric.
It's an electrolytic capacitor which is polarized. You can not apply AC to it (unless it's riding on a DC bias). Thus the voltage rating is given in working volts DC.
Thanks guys.
I was looking also for inductors of above 100mohm, and that can induct 2Arms.
In each inductor's datasheet, i see only DC current limit, how come?
Normally inductors are used to filter DC current so they are rated for that. To prevent the inductor from saturating with the AC current peak, use the dc value as the peak allowed AC current value, i.e. maximum DC current rating equals 1.4 times the desired AC rms current, or 2.5Adc for your desired 1.8Arms.
You are right
An inductors contributes Pi/2 radians to the total phase of the circuit.
An inductor reaching or not reaching to saturation has any influence of the fact that it contributes Pi/2 radians to circuit's phase?
I just cant design that circuit well
I'm trying to design a serial RLC circuit with a 235Vrms voltage source.
The circuit current should be 1.8Arms, and the resistor shouldn't be larger than 5-6 ohms becaues than its power consumption would exceed 20W and i wouldnt be able to find such a small tolerance resistor (or it would cost too much).
The circuit phase should be Pi/3 radians.
Is it possible?
You are right
An inductors contributes Pi/2 radians to the total phase of the circuit.
An inductor reaching or not reaching to saturation has any influence of the fact that it contributes Pi/2 radians to circuit's phase?
When the inductor starts to saturate its inductance is reduced. Thus the phase angle will change if you are depending upon a particular value of inductance and capacitance to determine the phase angle of the circuit.
The ESR (Equivalent Series Resistance) should be a minimum at low frequencies (as opposed to the capacitor reactance). It's caused by the intrinsic internal resistance in the cap.