In a parallel circuit, how is the voltage across each branch characterized?

In a parallel circuit, each branch is connected directly to the power source, meaning that the voltage across each branch remains constant and is equal to the voltage of the source. This characteristic is essential because it allows devices or components connected in parallel to operate independently of one another. Regardless of the number of branches or the individual resistances within each branch, they all experience the same voltage. This feature is particularly useful in various applications, such as household wiring, where different devices need the same voltage to function correctly.

Understanding this concept of voltage in parallel circuits helps to clarify why the other options do not apply. For instance, the idea that the voltage would be different for each branch contradicts the fundamental rule of parallel circuits. Similarly, saying the voltage is equal to the sum of resistances misrepresents Ohm's Law, as voltage is not calculated in this manner for parallel configurations. Lastly, the notion that the voltage decreases across each additional branch does not align with the principle that each branch maintains the same voltage as the source, independent of how many branches exist.