NAVEDTRA 14174A, NAVY ELECTRICITY AND ELECTRONICS TRAINING SERIES, MODULE 2-ALTERNATING CURRENT AND TRANSFORMERS Flashcards
What electrical circuit characteristic opposes the starting, stopping, or a change in value of current?
Inductance
What symbol is used for inductance?
L
What is the basic unit of inductance?
Henry (H)
Which mass characteristic opposes a change in velocity?
Inertia
What is the difference of potential or voltage which exists between two points in an electrical circuit called?
Electromotive force
What is the EMF induced in the conductor carrying the circuit called?
Self-induced
Which law states that “The induced EMF in any circuit is always in a direction to oppose the effect that produced it”?
Lenz’s Law
What can a conductor be formed into in order to increase inductance?
Loop/Coil
What are inductors classified according to?
Core type
An inductor has an inductance of 1 henry if an emf of 1 volt is induced in the inductor when the current through the inductor is changing at the rate of how many amperes per second?
1
What are the coils said to have if they are so positioned with respect to each other so that all of the flux of one coil cuts all of the turns of the other?
Unity coefficient of coupling
What is the requirement or the current in an inductor to increase to 63.2 percent of the maximum current or to decrease to 36.8 percent of the maximum current known as?
Time constant
Copper, Hysteresis, along with what else are the main power losses in an inductor?
Eddy-current
Which type of inductor power loss is due to power that is consumed in reversing the magnetic field of the core each time the current direction changes?
Hysteresis
Which type of inductor power loss is due to core heating caused by circulating currents induced in an iron core by the magnetic field of the coil?
Eddy-current
