# Homework Help: [Electrical Engineering]Finding current with mesh analysis(ac)

1. Apr 10, 2013

### equalP

1. The problem statement, all variables and given/known data

The question asks me to find io by using mesh analysis.

2. Relevant equations
KCL

3. The attempt at a solution
In fact, the question also asks me to find it by superposition and I found the answer should be:
i0=0.1+0.218 cos⁡(2000t+134°)-1.18 sin⁡(4000t+7.4°)

But I don't know how to use mesh analysis to solve the circuit with independent sources of different frequency.

Thanks for reading my post.

2. Apr 10, 2013

### Staff: Mentor

Hi equalP; Welcome to Physics Forums.

The idea behind using superposition is that you can solve for the effect of each source independently (by suppressing the others), then sum the results.

3. Apr 10, 2013

### equalP

Is it possible for me to solve this problem by using mesh analysis directly?

4. Apr 10, 2013

### Staff: Mentor

No, the impedances of the reactive elements are different for different frequencies. As a result, each source "sees" a different network, which will make the impedance matrices differ.

5. Apr 10, 2013

### equalP

Thank you. And I think the assignment may want me to write down it is impossible and explain why.

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