A.C. Theory, Lvl 1: Lesson #3- Becoming Familiar with inductive reactance.

Question 1

In a DC circuit, what limits current flow?

Answer 1

The resistance of the circuit

Question 2

What is the opposition to current flow in an AC circuit caused by an inductor called?

Answer 2

Inductive reactance

Question 3

The symbol for inductance is?

Answer 3

L

Question 4

Inductance is measure in ?

Answer 4

Henries

Question 5

The symbol for inductive reactance is?

Answer 5

XL

Question 6

Inductive reactance is measured by?

Answer 6

Ohms

Question 7

The reactance of an inductive circuit depends upon

Answer 7

When solving for the reactance (called inductive reactance) the unknowns in the equation are f (frequency) and L (inductance) with 2π a constant (= 6.28).

Question 8

Inductive reactance causes current to lag the voltage by ? .

Answer 8

90°

Induced voltage is 180° out of phase with the applied voltage, but the current in an inductive circuit is 90° out of phase and “lags” with respect to the applied voltage.

Question 9

If the frequency increases, the inductive reactance ? .

Answer 9

increases

Question 10

If the inductance is increased, the inductive reactance ? .

Answer 10

increases

Question 11

A manufacturer could produce a coil (inductive reactor) and put XL = 8 ohms on the nameplate only if the coil is labeled with the proper operating ? .

Answer 11

frequency

Inductive reactance is directly proportional to frequency, and, therefore, can only be determined if the frequency of the applied AC voltage is known.

Question 12

Knowing the voltage and the inductive reactance of a purely reactive circuit, drag the variables to the correct locations to create the formula used to solve for the current.

Answer 12

I = E / XL

Question 13

Study math

Answer 13

Study math