Question

How to calculate the current in circuit when there are two different batteries?

Answer 1

Answer:

In ideal circuit theory, the parallel connection of two voltage sources results in an inconsistent equation, e.g., a 3V and 2V source connected in parallel, by KVL, gives the equation: 3 = 2.

In the real world, batteries are not ideal voltage sources; batteries can supply a limited current and the voltage across the battery does, in fact, depend on the supplied current. This is represented as a series internal resistance.

So, the circuit diagram for the two batteries in parallel must include the internal resistances which will give consistent results.

The bottom line is that one of the batteries will supply power to the other and it is possible that one or both batteries will be damaged and, possibly, violently so.

Thanks for the question.

Hope it helps you.