Question 1

What is a henry?

Accepted Answer

A henry (H) is the SI unit of inductance. A coil has 1 H of inductance when a current change of 1 A/s induces 1 V.

Question 2

What are typical inductance values?

Accepted Answer

Small inductors: nH to μH (RF circuits). Medium: μH to mH (power supplies). Large: mH to H (transformers, motors).

Question 3

How does inductance relate to frequency?

Accepted Answer

Inductive reactance increases with frequency: X_L = 2πfL, where f is frequency in Hz and L is inductance in henries. This is why inductors block high-frequency signals and pass low-frequency ones.

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