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23 Cards in this Set
- Front
- Back
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Physical property of all AC circuits that opposes any change in current flow and is measured in henries (H)
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Inductance
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The opposition of the inductance to the flow of an alternating current is called ________
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Inductance Reactance
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The physical property of all AC circuits that opposes a change in voltage and is measured in farads (f)
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Capacitance
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________ is the opposition to the flow of current
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Capacitance Reactants
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The total opposition to current flow in a circuit, measured in Ohms.
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Impedance
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The time is takes for a generator to complete one cycle is called the _____
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period
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The number of cycles per seconds is called the frequency, which is measured in _____
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HERTZ
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Is the part of an AC generator in which voltage is produced. This component consist of many coils of wire that are large enough to carry the full load current of the generator.
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Armature
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Is the component that is used to drive the AC generator. EX diesel engine, steam turbine, or a motor
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Prime Mover
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Is the rotating component of the generator, driven by the generators prime mover, May be the armature or field.
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Rotor
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_____ is the part that is stationary.
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Stator
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______ are the electrical connections that are used to transfer power to and from the rotor of an AC generator. Brushes ride on this,
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Slip Rings
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Is the ratio between true power and apparent power
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Power Factor
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______ is the power consumed by an AC circuit
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True Power
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_____ is the power that is "stored" in an AC Circuit.
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Reactive Power
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The percentage difference between the speed of the rotor and the speed of the rotating magnetic field
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Slip
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If the spee of the rotor were the same as the stator, ________ between them would exist
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NO RELATIVE MOTION AND NO EMF
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3 Losses in an AC generator
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Internal Resistance
Hysteresis losses Mechanical losses |
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Delta advantages.
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If one phase becomes damaged the remaining phases can still deliver threee phase power at 57.7%
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AC advantages
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-can be sent over transmission lines cheaply
-can be transmitted at high voltage low current (low losses to heat) -uses transformer principles to change voltage to useful value -CHEAPER |
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Effective Value (RMS) = ___
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Peak value x .707
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Three requirements for electromagnetic induction
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-Magnetic Field
-Coductor -Relative motion between the two |
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Calculate frequeny of wave generated
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f = NP / 120
N = rotor speed (rpm) P = number of poles |
