RC circuit

Dear all,

i would like to ask a question about a RC circuit.
The supply is connected to a capacitor which is parallel to a resistor, then connect them to a high voltage discharge lamp.
There is a question: what is the functions of the capacitor and resistor.

Thanks

inverter motor

anyone can tell me what the inverter motor is?

Thanks

Starting factor

Hello everyone,

I need to estimate the starting current for 3 phase induction motor.
What should the starting current be for :
1)DOL
2)Star-Delta
3)ACVV
4)auto-transformer
,if the motor is 37kw;380v;50Hz.
And assume efficiency of the motor is 80%, power factor is 0.85.

Does it have any "starting factor" for different starting method?

solutions

Hello

Could anyone tell me more about "resonance" ? I 'm always confusing it.
Besides, how to switch the capacitors to correct the power factor? Detailed descriptions are more preferable.

Thanks a lot.
Lewis
;c;

p.f. correction 2

Hi

How can I solve the harmonic and resonance problems when I am dealing with the power factor correction?
Could anyone tell me the principle and steps of switching the capacitor to correct the power factor precisely?

Thanks a lot.
Lewis