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30 Cards in this Set
- Front
- Back
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Ac frequency for most aircraft is
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400 hz or 400 cycles per secound
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what is a sine wave
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a sine wave is a wave prouduced by a rotary generator one cycle begins at zero and ends at 360.
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phase
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when a sine wave crosses the zero line at the same time, the voltage and current are said to be in phase , in other words both voltage and current follow the identical sine wave.
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phase angle
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when certain circuit components cause a phase shift between the voltage and current, the amount of shift is referd to as the phase angle or the angle whose cosine is the powerfactor.
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alternating current
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ac current is current flow which continually changes its value and periodically reverses direction
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direct current
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dc electricity is nonvarying
in nature, the amplitude of volatage and current remain stedy. |
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apparent power
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when both current and voltage are given in effective values the product of those effective values is called aparent power
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true power
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true power is the actual ac power in current when phase is taken into acount
ExIxpowerfactor= true power |
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resistive circuits
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circuits containg componets such as lightbulbs,heaters,and compostion restistors are considerd to be resistive circuits
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inductance
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is a measure of the amount of magnetic flux produced for a given electric current.
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inductance reactacne
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inductave reactince is the oppostion to the flow of alternating current cause by a generation of back voltage
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transformer
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a transformer allows the values of ac voltage and current to be changed through the use of mutual inductance.
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capacitors
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a capacitor sometimes called a condensor is a device that stores electrical energy in the electrostaic fields that exist between two conductors that are seperated by an insulator or dielectric.
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farads and columbs
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a capacitors ability to store an electrical charge is mesured in farads. one farad is the capacity required to hold one coloumb of electricity under a force of 1 volt
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switches
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off is down on is up
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Ac frequency for most aircraft is
|
400 hz or 400 cycles per secound
|
|
|
what is a sine wave
|
a sine wave is a wave prouduced by a rotary generator one cycle begins at zero and ends at 360.
|
|
|
phase
|
when a sine wave crosses the zero line at the same time, the voltage and current are said to be in phase , in other words both voltage and current follow the identical sine wave.
|
|
|
phase angle
|
when certain circuit components cause a phase shift between the voltage and current, the amount of shift is referd to as the phase angle or the angle whose cosine is the powerfactor.
|
|
|
alternating current
|
ac current is current flow which continually changes its value and periodically reverses direction
|
|
|
direct current
|
dc electricity is nonvarying
in nature, the amplitude of volatage and current remain stedy. |
|
|
apparent power
|
when both current and voltage are given in effective values the product of those effective values is called aparent power
|
|
|
true power
|
true power is the actual ac power in current when phase is taken into acount
ExIxpowerfactor= true power |
|
|
resistive circuits
|
circuits containg componets such as lightbulbs,heaters,and compostion restistors are considerd to be resistive circuits
|
|
|
inductance
|
is a measure of the amount of magnetic flux produced for a given electric current.
|
|
|
inductance reactacne
|
inductave reactince is the oppostion to the flow of alternating current cause by a generation of back voltage
|
|
|
transformer
|
a transformer allows the values of ac voltage and current to be changed through the use of mutual inductance.
|
|
|
capacitors
|
a capacitor sometimes called a condensor is a device that stores electrical energy in the electrostaic fields that exist between two conductors that are seperated by an insulator or dielectric.
|
|
|
farads and columbs
|
a capacitors ability to store an electrical charge is mesured in farads. one farad is the capacity required to hold one coloumb of electricity under a force of 1 volt
|
|
|
switches
|
off is down on is up
|
