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Module 17 in the Syllabus
Curriculum

AC Current Cards
Chapter from the Wisebridge Learning System for Physics

AC Current Images
Image gallery for study with links to larger teaching JPEGs for classroom presentation

Question Drill for AC Current
Conceptual Vocabulary Self-Test

Basic Terms Crossword Puzzle

Basic Puzzle Solution

Conceptual Vocabulary
Alternating currentAn alternating current is an electrical current whose magnitude and direction vary cyclically, as opposed to direct current, whose direction remains constant.
InductorAn inductor is a passive electrical device employed in electrical circuits for its property of inductance.
InductanceThe inductance is the ratio of the magnetic flux to the current of the circuit in which an electric current is flowing and inducing a magnetic flux through the circuit.
Electrical impedanceElectrical impedance describes a measure of opposition to a sinusoidal alternating current.
TransformerA transformer is a device that transfers electrical energy from one circuit to another through inductively coupled wires.
ReactanceReactance is the imaginary part of electrical impedance, which measures the opposition to a sinusoidal alternating current arising from the presence of inductance and capacitance within a circuit.
PhasorA phasor is a vector used in circuit analysis with constant length and constant phase angle, usually represented as a complex exponential.
RLC circuitAn RLC circuit is an electrical circuit consisting of a resistor, an inductor, and a capacitor, connected in series or in parallel.
Output impedanceThe output impedance is the opposition exhibited by its output terminals to the flow of an alternating current of a particular frequency as a result of resistance, inductance and capacitance.
AdmittanceThe admittance is the inverse of the impedance.
Impedance matchingImpedance matching is the practice of attempting to make the output impedance of a source equal to the input impedance of the load to which it is ultimately connected.
Electronic filterElectronic filters are electronic circuits which perform signal processing functions, specifically intended to remove unwanted signal components and/or enhance wanted ones.
RectifierA rectifier is an electrical device that converts alternating current to direct current, a process known as rectification.
Q factorThe Q or quality factor compares the time constant for decay of an oscillating physical system's amplitude to its oscillation period.
SusceptanceThe susceptance is the imaginary part of the admittance.
Volt-amperes reactiveIn alternating-current power transmission and distribution, volt-amperes reactive are the product of the rms voltage and current, or the apparent power, multiplied by the sine of the phase angle between the voltage and the current.
AutotransformerIn an autotransformer a portion of the same winding effectively acts as part of both the primary and secondary winding.
ChokeA choke is an inductor designed to have a high reactance to a particular frequency when used in a signal-carrying circuit.
Magnetic reluctanceMagnetic reluctance can be thought of as having an analogous function to resistance in an electrical circuit except that it cannot consume energy.
Leakage inductanceLeakage inductance is the property of an electrical transformer that causes a winding to appear to have some self-inductance in series with the mutually-coupled transformer windings.



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