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eehelp150

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## Homework Statement

Find Va(t) using Nodal Analysis:

## Homework Equations

Zc = 1/(jwC)

Zl = jw*L

## The Attempt at a Solution

W = 250

Z36mH = j9 ohm

Z80mH = j20 ohm

Z0.25mF = -j16 ohm (is capacitor impedance always negative? It says so in my instructor's notes but I forgot why)

20cos(250t) -> 20 <0° V

1.2cos(250t+45°) -> 1.2<45° A

Are the following Nodal equations correct? Is Node1 simply Va?

Node1:

[tex]\frac{Node1-20<0}{8+9j} + \frac{Node1}{-j16}=0[/tex]

Node2:

[tex]-1.2<45° + \frac{Node2-4Va}{j20}=0[/tex]