How does the voltage across each component in a parallel circuit compare?

In a parallel circuit, the defining characteristic is that all components are connected across the same two nodes, which means they share the same voltage across each component. This is a fundamental principle of parallel circuits and results from the way voltage operates in electrical systems.

In a parallel arrangement, the electrical potential difference (voltage) remains constant because each component has its terminals connected to the same points in the circuit. Therefore, regardless of the individual resistances of each component, the voltage measured across them will be identical to the voltage of the power source supplying the circuit. This constant voltage across each component is what allows for the independent operation of each device within the circuit.

The other choices suggest incorrect relationships about voltage in parallel circuits. For example, the idea that the voltage varies depending on resistance contradicts the fundamental property of parallel circuits, where each pathway experiences the same voltage. Similarly, stating that one component has a higher voltage or that voltage is only measured at the power source does not align with how voltage functions in this type of circuit configuration.