Inductive and Capacitive Reactance
Reactance is measure of the opposition to the flow of alternating current caused by the inductance and capacitance in a circuit rather than by resistance. Steady electric currents flowing along conductors in one direction undergo opposition called electrical resistance, but no reactance. Reactance is present in addition to resistance when conductors carry alternating current. Reactance also occurs for short intervals when direct current is changing as it approaches or departs from steady flow (e.g., when switches are closed or opened).
Reactance is of two types: inductive and capacitive. Inductive reactance is associated with the varying magnetic field that surrounds a wire or a coil carrying a current. Capacitive reactance is associated with the changing electric field between two conducting surfaces (plates) separated from each other by an insulating medium.
This online PDH course is applicable to electrical engineers, design and construction personnel, technical staff and facility personnel who are interested in gaining a better understanding of inductive and capacitive reactance.
This continuing education course is intended to provide you with the following specific knowledge and skills:
- State the phase relationships between current and voltage in an inductor and in a capacitor
- State the terms for the opposition an inductor and a capacitor offer to AC
- Write the formulas for inductive and capacitive reactance
- State the effects of a change in frequency on inductive and capacitive reactance
- State the effects of a change in inductance on XL and a change in capacitance on XC
- Compute total reactance (X) in a series circuit and indicate whether the total reactance is capacitive or inductive
- Write the formula for total reactance and impedance
- Write the Ohm's law formulas used to determine voltage and current in an ac circuit
- Define true power, reactive power, and apparent power
- State the definition of and write the formula for power factor
In this course, you need to review Chapter 4 of Module 2 titled "Inductive and Capacitive Reactance" of the Naval Education and Training Materials (NAVEDTRA 14174), Electricity and Electronic Training Series, provided below.
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