Overview
Inductance is the property of an electric circuit component that opposes any change in electric current. It is a measure of the amount of magnetic flux produced for a given electric current and is designated by letter “L”. An inductor is a component designed to produce a specific inductance i.e. having no resistance or capacitance. An inductor, when subjected to an increasing electrical current flow, generates a back voltage that opposes this current. Inductance quantifies how much energy an inductor can store and is expressed in henrys (h). An inductor consists of at least one winding of wire, but it usually has more. Examples of inductors or devices having inductance are transformers, chokes, coils relays and motors.
The relationship of current, magnetism, and motion is important to the topic of inductance. This 3-hr course will discuss these aspects in detail and is based entirely on Naval Education and Training Materials (NAVEDTRA 14174), Electricity and Electronic Training Series; Module-2, Chapter 2 titled “Inductance”.
The student must take a multiple-choice quiz consisting of fifteen (15) questions at the end of this course to obtain PDH credits.
Specific Knowledge or Skill Obtained
This course teaches the following specific knowledge and skills:
- Define the term "inductance,” "induced emf" and "counter emf."
- State Lenz's law
- List five factors that affect the inductance of a coil and state how various physical changes in these factors affect inductance
- State the principles and sequences involved in the buildup and decay of current in an LR series circuit
- State the three types of power loss in an inductor
- Define the term "mutual inductance” and “coefficient of coupling”
- Given the inductance values of and the coefficient of coupling between two series-connected inductors, solve for mutual inductance, M
- Write the formula for the "total inductance" of two inductors connected in series-opposing
- Given the inductance values of and the mutual inductance value between two coils connected in series-aiding, solve for their combined inductance, LT
Course
Click on the following link to the PDF document to review the course material before taking the quiz for credit.
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