# Superposition with dependent sources

If the value of a dependent source (say CCCC) depend on the value of an independent source (say a current source). When setting the current source to 0, would that make the CCCC an open circuit (i.e. set to zero) as well?

Cheers

## 1 Answer

Do you mean CCCS (current controlled current source)?

The answer is to treat the CCCS as you would any other source acting alone, i.e. generating it's specified current, say $$\kI_x\$$, which is dependent on the current in the nominated path, $$\I_x\$$. You must not use the trivial solution, $$\I_x =0\$$ at this stage; doing so is a common error.

• Sorry I meant CCCS. Lets say that there is a current source providing current I1, and a dependent source (CCCS) which its current is equal to 3*I1. If we sat the current source to zero (I1=0; open circuit), wouldn't the CCCS be an open circuit too? – William Mar 24 at 4:13
• No. Dependent sources are treated in the same way as independent sources. Note the final sentence of my answer. – Chu Mar 24 at 9:04