L9: Inductive Reactance and RL Circuits

Question 1

What is Inductive Reactance, XL

Answer 1

When AC flows through an inductor, the amount of current is much less than the DC resistance alone would allow. The additional opposition of an inductor to sine wave alternating current is called Inductive Reactance XL with units of Ω.

(There is no XL for steady direct current).

Question 2

What equations are there for Inductive Reactance, XL

Answer 2

XL = 2πfl
or
XL = VL/IL

Question 3

How is Inductive Reactance added in Series

Answer 3

Question 4

How is Inductive Reactance added in parallel

Answer 4

Question 5

How does the sine wave IL relate to the sine wave of VL

Answer 5

Question 6

How are XL and R related in Series & What is the Phasor Voltage Triangle for it

Answer 6

Question 7

What is the Impedance Z Triangle for R and XL in series

Answer 7

Question 8

Answer 8

Question 9

Example Problem: Find the Impedance and Phase Angle of the following Circuit

Answer 9

Question 10

How are XL and R related in Parallel

Answer 10

Question 11

What is the Phasor Current Triangle, Phase Angle, and Equivalent Impedance for R and XL in series

Answer 11

Question 12

Answer 12

Question 13

Example Problem: Find the Total and Phase Angle of the following Circuit.

Answer 13

Question 14

Summary of RL Formulas

Answer 14