# Homework Help: Short circuit current

1. Mar 12, 2014

### princejan7

1. The problem statement, all variables and given/known data
http://postimg.org/image/b8p4rszot/

There is a short circuit between the terminals a-b

2. Relevant equations

3. The attempt at a solution

so I found the node voltages at 1 and 2, but I don't know how to use these to get the short circuit current...

2. Mar 12, 2014

### Staff: Mentor

If the short circuit current is just the current that flows in the a-b wire when terminals a and b are shorted, it would look to inolve the 3A current source and the current through the 16 Ohm resistor...

#### Attached Files:

• ###### PF Circuit 01.png
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3. Mar 12, 2014

### princejan7

whats the current through the 16ohm resistor that enters terminal a? is it 3A?

4. Mar 12, 2014

### Staff: Mentor

Beats me. Show us your KCL equations and your solution of them. We can check your work.

5. Mar 13, 2014

### princejan7

http://postimg.org/image/4b0617wj1/

I tried writing KCL equation's at the nodes marked to solve for the short circuit current but they're incomplete since I don't know how to express the current through the 16 ohm resistor entering/exiting those nodes

6. Mar 13, 2014

### Staff: Mentor

I = V2 / 16 Ohms

7. Mar 14, 2014

### princejan7

ok thanks

also, does the short circuit current through a-b include anything of the 3A current source?

8. Mar 14, 2014

### Staff: Mentor

Yes, assume it does and proceed to form the node equations accordingly.