Red Seal Construction Electrician 2025 – 400 Free Practice Questions to Pass the Exam

Voltage drop refers to the reduction in voltage that occurs in an electrical circuit as electrical energy is transmitted from the source (such as a generator or transformer) to the load (like a motor or light fixture). This reduction happens due to the resistance of the conductors, particularly in long cable runs. The longer and thinner the wire, the more resistance it presents, which leads to a greater reduction in voltage as the electricity travels along the conductor.

Understanding voltage drop is crucial for ensuring that electrical devices receive sufficient voltage to operate correctly. If the drop is too significant, the devices may not function properly or may be damaged due to inadequate voltage levels. Electricians often calculate voltage drop to ensure that the circuit design can accommodate the loads without experiencing excessive loss. Keeping the voltage within acceptable limits is part of good electrical practice and is mandated by codes and standards in many jurisdictions.