Define 'voltage drop' in electrical systems.

Voltage drop refers to the phenomenon where the voltage decreases along the length of an electrical circuit as electric current flows through it. This reduction occurs due to the resistance and impedance of the conductors and any connected components. When voltage is supplied from a source (like a transformer or circuit breaker) and travels to a load (such as a light fixture or motor), some of that voltage is lost due to these factors, which can impact the performance of the electrical system.

Understanding voltage drop is crucial for ensuring that the voltage at the load is sufficient for proper operation. Too much voltage drop can result in equipment not performing as expected, leading to overheating, reduced efficiency, or even failure of the equipment. Therefore, the correct definition of voltage drop emphasizes that it is the reduction in voltage experienced between the source and the load in an electrical circuit. This concept is key in circuit design and analysis to ensure that electrical systems function reliably and efficiently.