CRO display (involve D.C and A.C)

[950315]

Homework Statement

So my question is, why isn't D a correct answer?

And also, what will happen to the voltage and ampere, if I connect a A.C. and D.C. parallel?

Homework Equations

The Attempt at a Solution

 

[gneill]

Homework Statement

So my question is, why isn't D a correct answer?

And also, what will happen to the voltage and ampere, if I connect a A.C. and D.C. parallel?

Both voltage sources will insist on forcing the result to be equal to their own values. The resulting "struggle" between them will make them want to produce very large currents indeed; if they are ideal sources the currents would be infinite!. One or both of the sources or the connecting wires between them must fail (zzzzZZT! BANG!). Not so good

 

[950315]

Both voltage sources will insist on forcing the result to be equal to their own values. The resulting "struggle" between them will make them want to produce very large currents indeed if they are ideal sources the currents would be infinite!. One or both of the sources or the connecting wires between them must fail (zzzzZZT! BANG!). Not so good

Alright, thank you very much ! :)