22.2 Resistance

As with a DC circuit, the resistance R in an AC circuit is defined as the ratio of voltage v to current i,

Even though both the voltage v and current i are both functions of time, they are in phase with each other so their ratio is a constant.

We can also write this resistance as

 

Alternating Current (AC)

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rms Values

(c) Doug Davis, 2002; all rights reserved