Current Source in Parallel with Short Circuit

[nickadams]

Homework Statement

Which of the following are self-contradictory combinations of circuit elements?

- A 2 Amp current source in parallel with a short circuit.

Homework Equations

KVL- "the sum of voltages around a closed loop amounts to 0.
KCL- "the current into a node equals the current out of a node.
Ohm's Law- V= IR

The Attempt at a Solution

The answer key says this is not contradictory, but I don't see how we can have such a circuit... If we had a short circuit parallel to a current source wouldn't all the current go into that short circuit branch and ignore the other branches? Then we'd just have a loop of 2 Amp current with no voltage drop... Why wouldn't that violate KVL?

 

[ehild]

An ideal current source provides a given current no matter what the load is. The voltage across it is equal to the generator current multiplied by the loading resistance, zero for a short-circuit. Where is contradiction?

 

[Bystander]

What are the other choices you're given?

 

[nickadams]

An ideal current source provides a given current no matter what the load is. The voltage across it is equal to the generator current multiplied by the loading resistance, zero for a short-circuit. Where is contradiction?

I just always thought that in order for current to flow between two points we need a voltage difference...

What are the other choices you're given?

I understand the rest of them... It was only this one I was hung up on

 

[ehild]

I just always thought that in order for current to flow between two points we need a voltage difference...

What is the voltage difference across zero resistance according to Ohm's Law?

 

[nickadams]

What is the voltage difference across zero resistance according to Ohm's Law?

V=IR so V=I*0=0. Ok I think I see now