# Different and opposing voltage sources?

simulate this circuit – Schematic created using CircuitLab

The diagram above, the voltage sources are equal and wired parallel, they would increase the current(2x) flow to the load(R), but what about this case:

simulate this circuit

Are the two voltage sources in series now?

• You could say they are in series in a short circuit. Output will be 0 (or smoke). – Brian Drummond Oct 14 '15 at 22:59
• The dual of your question (ideal current sources in series, instead of voltage sources in parallel) was asked before: Current and voltage sources? – The Photon Oct 14 '15 at 23:02
• The answer is the same: You have either created a contradictory circuit, or your model of your voltage sources is inadequate to predict the behavior of the circuit. – The Photon Oct 14 '15 at 23:02
• Basically a duplicate of electronics.stackexchange.com/questions/192584/… but I'm out close votes for today. – Fizz Oct 14 '15 at 23:33

$$5 = -5$$