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In a parallel electrical circuit, each load is connected directly to the power source, allowing each load to receive the same voltage. This configuration means that regardless of the individual resistance values of the loads, they will all experience the same amount of voltage drop across them, which is equal to the voltage supplied by the source.
In contrast, in a series circuit, loads are arranged sequentially, meaning the voltage drop across each load is dependent on its resistance and the total circuit resistance. The voltage is divided among the loads based on their resistance values, so different loads will have different voltage drops.
This fundamental property of parallel circuits allows for consistent voltage across all connected devices, making it an effective configuration for applications where each device must operate under the same voltage conditions.