# Voltages across circuit elements

## Homework Statement

The voltages across two circuit elements in series is zero. Is it possible that the voltages across the individual elements are nevertheless not zero? Give an example.

NA

## The Attempt at a Solution

I am not really sure where to start with this problem. Any suggestions?

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Delphi51
Homework Helper
I can't give away very much because you haven't shown an attempt.
How about listing some "circuit elements"?
Could you meet the condition with two resistors and a current flowing through them? Why not? How about two ???? elements?

From my point of view it seems that the only way two nonzero voltages could add up to a zero voltage is if both individual voltages were equal but of opposite sign for two circuit elements in series. Does this seem plausible?

I read up a little bit on this subject and found that at resonance xL=xC, IxL=Ixc, therefore VL=Vc.

Delphi51
Homework Helper
With inductors, you would be in the same position as with resistors; two voltages adding to make a larger voltage.
both individual voltages were equal but of opposite sign
Definitely on the right track here! Forget inductors, resistors, capacitors. Can you use two batteries?

gneill
Mentor
Don't forget inductors and capacitors! Consider a series RLC circuit (with small R) driven by a voltage source near the resonance frequency. Think about phase relationships.