What will happen to the circuit voltage when two power sources are connected in parallel?

When two power sources are connected in parallel, the voltage across the terminals of the circuit remains the same as the voltage of the individual sources, provided that these sources have the same voltage rating. This is because in a parallel configuration, all components share the same two nodes, and therefore, the potential difference (voltage) across each power source is identical.

In practical terms, if you were to connect, for example, two 12-volt batteries in parallel, the voltage across the overall circuit would still be 12 volts. The primary benefit of connecting batteries in parallel is to increase the total available current while keeping the voltage constant, which is useful for applications requiring more current without changing the voltage level.

This principle aligns with Kirchhoff's voltage law, where the total voltage around a closed loop in a circuit must equal zero; thus, the voltage at any point in a parallel circuit is consistent with the voltage ratings of the sources involved. Therefore, the correct understanding is that connecting power sources in parallel results in the circuit voltage remaining the same as that of the individual sources, assuming they are of the same voltage.