Unformatted text preview: currents for a capacitor because of the out of phase relationships mentioned above. To find a way to use Ohm’s Law, a quantity known as the impedance Z is defined: V
Z = rms I rms
For a resistor, Z = R. For a capacitor or an inductor, Z can be a complicated expression that takes into account the out
of
phase relationship between voltage and current; however, for simple magnitudes, the following is true: 1
Capacitors: Z =
Inductors: (ω = 2πf) Z = ! L !C
Unfortunately, it is not correct to simply add these quantities in series or in parallel when a circuit contains R and C and L. For simple examples, the results are shown below: Vrms
1
= ZC = R 2 + 2 2 I rms
!C Pavg = Vrms I rms cos!...
View
Full Document
 Spring '14
 the00, Pavg

Click to edit the document details