Which measurement remains constant in a parallel circuit?

In a parallel circuit, the voltage across each component is the same. This is a key characteristic of parallel circuits, where all components are connected across the same two points of supply. As a result, every branch or pathway in the circuit experiences the same voltage level, regardless of the resistance in each branch.

In contrast, the current can vary depending on the resistance of each branch; it is divided among the branches according to their resistances. Thus, while the total current flowing from the source can change with the addition of more branches, the voltage remains constant across all components. This principle is essential for understanding how parallel circuits function in electrical systems.

The measurement of resistance, or ohms, can vary across different components in the circuit, as each component may have a different resistance. Amperage, which refers specifically to current, varies as well in each parallel branch of the circuit. Therefore, the only measurement that remains consistent across all components in a parallel circuit is the voltage.