Current from a sine wave signal

[dancergirlie]

Homework Statement

Given a sine wave signal (20V PP) connected to a 10 kilo-Ohm resistor. Calculate the current through the resistor in terms of average, rms, and peak currents. What wattage rating should the resistor have?

Homework Equations

Vrms=(1/Sqrt(2))(Vp)
V=IR

The Attempt at a Solution

For peak I'm assuming that since peak voltage means peak current, we would find the peak current by:

Vp=IR where Vp=Vpp/2=20/2=10V

So: Imax=(10V)/(10E3)= 1E-3 A

Since Vrms=Vp/sqrt(2)

Irms=Vrms/R=(10/sqrt(2))/(10E3)=7.07E-4A

I don't know how to fine I average though...

Any help would be great!

 

[gneill]

What's the average of a sinewave?