Final answer:
In a parallel circuit with a constant voltage power supply, each branch experiences the same voltage drop, which is equal to the full voltage of the source. The current varies per resistor based on their resistance.
Step-by-step explanation:
In a parallel circuit with a constant voltage power supply, the voltage drop across each branch is the same. This means that every resistor in a parallel circuit has the full voltage of the source applied to it. Despite having the same voltage drop, the current through each resistor may differ, depending on their individual resistances.
In contrast to a series circuit, where the voltage drop across each resistor can vary and the current is constant through all components, a parallel circuit maintains a consistent voltage drop across all branches. It's important to remember that in a parallel circuit, the combined total of the currents flowing through each branch is equal to the total current leaving the source, rather than the voltage adding up.