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

When a load is first turned on in a circuit, a surge of current typically occurs due to the initial inrush of energy needed to overcome the impedance of the load. This phenomenon is especially significant in inductive loads, such as motors, transformers, or solenoids, which can draw a much higher current momentarily (known as inrush current) than they will once they stabilize in operation.

This initial surge happens because the components in the circuit need time to reach their operating state, and during this transition period, the resistance may be lower, allowing a larger current to flow. As the load stabilizes and reaches its normal operating conditions, the current gradually decreases to a steady state, which is determined by the load's rated requirements and impedance.

Understanding this behavior is crucial for electrical design and safety considerations. Engineers must account for inrush current when sizing conductors, protective devices, and equipment ratings to prevent tripping breakers or damaging components in the system.