Exam 21: Inductive Reactance

For an inductor, the induced voltage, V_L always ______________ the current by 90°.

Inductor values ______________ 1 μH are generally not practical for use in electronic circuits.

Inductive reactance only applies to

The amount of inductive reactance equals two pi times the frequency plus the inductance.

There is inductive reactance for steady direct current.

Since reactance is an opposition in ohms, the values X_L in series or parallel are combined the same way as ohms of resistance.

Frequency is equal to

The constant factor 2p indicates the circular motion from which a sine wave is derived.

The combined parallel inductive reactance will be greater than the lowest branch reactance.

The amount of current in an ac circuit with only inductive reactance is ______________ the applied voltage divided by X_L.

The polarity of an inductor's counter emf is always such that it ______________ a change in current.

How much is the X_L for a coil with negligible resistance that has 62.8 V across it with 0.1 A of current?

When alternating current flows in an inductance, the amount of current is much less than the dc resistance alone would allow.

In a series circuit containing two inductors and a voltage source, the current is less in the inductor with the higher inductance.

X_L equals

The higher the frequency of the alternating current, and the greater the inductance, the X_L opposition will be increased.

What results from an inductor's counter emf with a varying current?

For an inductor, the induced voltage V_L always

Inductor values ______________ 1 mH are generally not practical for use in electronic circuits.

In a parallel circuit with two inductors and voltage source, the voltage is the same across both inductors and is equal to the voltage source.