IBEW Electrical Practice Test 2025 – Complete Exam Preparation

Question: 1 / 400

What does the term "inrush current" refer to?

The normal operating current of a device

The maximum surge of current when a device is turned on

The term "inrush current" refers to the maximum surge of current that occurs when a device is initially powered on. This phenomenon is particularly prominent in inductive loads, such as motors and transformers, where the initial demand for current can be significantly higher than the normal operating current. During startup, these devices may draw several times their rated current for a brief moment until reaching stable operating conditions. Understanding this concept is crucial in electrical applications to properly size circuit breakers and to ensure that the electrical system can handle these temporary surges without tripping or damaging equipment.

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The steady state current in a circuit

The current that flows during a short-circuit event

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