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## Main Question or Discussion Point

I'm confused about a point concerning complex power calculations. The formula my text gives is S=V(eff)I(eff)*. I'm confused about what the conjugate is for I(eff). The way I understand it, I(eff) = I(rms) and I(rms) = I(m)/√2. Since I(m) is a real number, and I(m)/√2 is real, how is there a conjugate.

For example:

i(t)= 20cos(ωt+165)

I(m)=20

I(eff)=20/√2

...so what is I(eff)*?

I've read through the textbook book the only examples that I can find use the equation: S=(1/2)VI*.

I would be grateful for any help you could provide to help me understand this.

For example:

i(t)= 20cos(ωt+165)

I(m)=20

I(eff)=20/√2

...so what is I(eff)*?

I've read through the textbook book the only examples that I can find use the equation: S=(1/2)VI*.

I would be grateful for any help you could provide to help me understand this.