Define 'voltage drop' in electrical circuits.

Voltage drop refers to the reduction in voltage as electrical energy moves through a circuit due to resistance in the conductors and components. When current flows, the energy is consumed by resistive elements, leading to a decrease in the voltage available to the load at the end of the circuit compared to the voltage at the source. This phenomenon is important in electrical engineering and installation because excessive voltage drop can affect the performance of electrical devices and systems.

In practical terms, voltage drop can be influenced by the length and gauge of the conductors, the amount of current flowing, and the total resistance of the circuit. Understanding voltage drop is essential for ensuring that electrical systems operate efficiently and safely.