Inductance in AC Circuits Flashcards
Circuits are generally considered to contain inductance when ________
Any type of load that contains a coil is used, such as motors, transformers, lighting ballast, and chokes
________ is one of the primary types of loads in AC circuits
Inductance (L)
CEMF is an abbreviation for ________
Counter-electromotive force
When an inductor is connected to an alternating voltage, the magnetic field continually increases, decreases, and reverses polarity, causing ________
A voltage to be continually induced in the coil
________ is always in opposition to the applied voltage
Induced voltage
How many degrees is the applied voltage and the induced voltage out of phase with one another
180 degrees
The current-limiting property of an inductor is called ________. When this property is caused by inductance, it is called ________
Reactance (X), inductive reactance (XL)
________ is a countervoltage that limits the flow of current, as does resistance
Inductive reactance
What is the unit of measurement for inductive reactance?
Ohms
Inductive reactance is proportional to the ________ and the ________
Inductance of the coil; frequency of the line
What is the formula for calculating inductive reactance?
XL = 2πfL
When inductors are connected in series, the total inductance is equal to the ________
Sum of all the inductors
When inductors are connected in parallel, the total inductance is equal to the ________
Reciprocal of the sum of the reciprocals of all the inductors
When current flows through a pure resistive circuit, the current and voltage are ________. In a pure inductive circuit, the current lags voltage by ________
In phase with each other; 90 degrees
An electrical measurement called ________ is used to measure the reactive power in a pure inductive circuit
Volt-ampere-reactive (VARs)
