[Amps] DC Blocking Capacitor

[G3rzp@aol.com]

In a message dated 27/04/2005 08:16:15 GMT Standard Time,  
philc at texascellnet.com writes:

This has  been called several things over the
years; suseptance, admittance, and  conductance; measured in siemens or
sometimes  mhos.



Conductance G is the reciprocal of Resistance R
Susceptance B is the reciprocal of Reactance X
Admittance Y is the reciprocal of  Impedance Z
 
B, G and Y are measured in Siemens - used to be mhos.
R, X and Z are measured in ohms. of course.
 
Capacitors have a voltage rating and a VA ( Volts times Amps)  rating,  or 
for our purposes, kiloVA: this determines the current rating. Similar to the  
voltage limitation on a resistor, which can of course mean that a high ohmic  
value 1 watt resistor can never dissipate 1 watt before its voltage rating is  
exceeded. In the same way, a capacitor can have a current rating of so many  
amps, but at some frequencies, the resulting volts across it get so high that it 
 suffers voltage punch through.
 
The same applies to inductors, but we don't usually have to worry about the  
voltage across them getting too high, just them getting too hot!
 
73
 
Peter G3RZP