When an inductor is placed in a DC circuit, how does the current draw compare to an AC circuit with the same voltage?

Prepare for your Electrical Apprenticeship Year 2 L8-20 Test. Use flashcards and multiple choice questions with hints and explanations to ace your exam!

In a DC circuit, when an inductor is placed in the current path, it initially resists changes in current flow due to its ability to store energy in a magnetic field. When the circuit is first energized, the inductor will cause the current to ramp up gradually rather than instantly, effectively limiting the initial current draw. Once the current reaches a steady state, the inductor acts like a short circuit, allowing current to flow freely.

In contrast, in an AC circuit, the behavior of an inductor is quite different due to the continuously varying nature of alternating current. The inductor doesn't just resist changes in the same way; it actually introduces reactance, calculated with the formula (X_L = 2\pi f L), where (f) is the frequency and (L) is the inductance. This reactance effectively opposes the flow of AC more so than a DC current once steady state is achieved.

Therefore, when comparing the inductor's effect in DC versus AC circuits at the same voltage, more current can actually be drawn in the DC circuit once it reaches steady state because the inductor behaves differently based on the nature of the current. AC circuits will always have a degree of impedance from the inductor

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