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Review For Board Exam > AC CIRCUITS > Flashcards

AC CIRCUITS Flashcards

1
Q

it is form of electricity that flows in an alternating directions and/or possessing a voltage with alternating polarity over time.

A

-ALTERNATING CURRENT

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2
Q

the shape of a graph of the varying quantity against time or distance is called

A

-WAVEFORM

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3
Q

the standard ac waveform is the

A

-SINE WAVE

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4
Q

is the number of cycles in one second.

A

-FREQUENCY

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5
Q

the length of time is takes to complete one cycle. It is basically the reciprocal of the frequency.

A

-PERIOD

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6
Q

is the distance between two points of similar cycles of a periodic wave.

A

-WAVELENGTH

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7
Q

the value of the wave at its peaks.

A

-AMPLITUDE

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8
Q

is the value of a sine wave at any instant of time or at any angle rotation. It is denoted by a lowercase letters v and i for voltage and current repectively.

A

-INSTANTANEOUS VALUE

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9
Q

is the maximum value denoted by Vm or Vp for voltage and Im or Ip for current.

A

-PEAK VALUE

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10
Q

is the arithmetic average of all the values in a sine wave for 1 half-cycle.

A

-AVERAGE VALUE

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11
Q

value of an alternating sine wave is the value that gives the same heating effect as a steady direct current or voltage source.

A

-ROOT MEAN SQUARE

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12
Q

rms is also considered as

A

-EFFECTIVE VALUE

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13
Q

is the ratio of the rms value to the average value.

A

-FORM FACTOR

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14
Q

is the ratio of peak value to the rms value.

A

-PEAK FACTOR

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15
Q

phase is an angular measurement that specifies the position of a sine wave relative to a reference.

A

-AC PHASE RELATIONSHIP

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16
Q

is defined as one waveform that is ahead of another in its zero crossing on the horizontal axis. Sine wave is shifted to left or reference by angle.

A

-LEADING WAVEFORM (PHASE SHIFT SINE WAVE)

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17
Q

is one that is behind another. Sine wave shifted to the right of reference by an angle.

A

-LAGING WAVEFORM (PHASE SHIFT SINE WAVE)

18
Q

is a rotating arrow used to represent the time varying quantities in terms of their magnitude and angular measurements.

A

-PHASOR

19
Q

is the total opposition to ac current with the resistance and total reactance of the circuit combined.

A

-IMPEDANCE

20
Q

gives the angle between the total voltage and current in AC circuit.

A

-IMPEDANCE ANGLE

21
Q

is the opposition to ac current other than resistance due to inductance and/or capacitance in the circuit . It is dependent on the frequency of the ac source.

A

-REACTANCE

22
Q

is the opposition to alternating current in a capacitor. It varies inversely with the frequency of the ac source.

A

-CAPACITIVE REACTANCE

23
Q

is the opposition to alternating current in a inductor. It varies inversely with the frequencny of the ac source.

A

-INDUCTIVE REACTANCE

24
Q

is the opposition to ac current by the same factor as in dc in resistive circuits.

A

-RESISTANCE

25
Q

the reciprocal of impedance in seiemens, the over all ability o an electric circuit to pass alternating current.

A

-ADMITTANCE

26
Q

the ability of the inductance and capacitance to pass ac in siemens the imaginary component of admittance.

A

-SUSCEPTANCE

27
Q

the ability of an inductor to permit current to flow.

A

-INDUCTIVE SUSCEPTANCE

28
Q

the ability of a capacitor to permit the flow of current.

A

-CAPACITIVE SUSCEPTANCE

29
Q

the current always lags behind the voltage by 90 electrical degrees. remember ELI

A

-PURELY INDUCTIVE REACTANCE

30
Q

the current always leads the voltage by 90 electrical degrees. remember ICE

A

-PURELY CAPACITIVE CIRCUITS

31
Q

the product of RMS value ofthe voltage and current.

A

-APPARENT POWER

32
Q

the power actually consumed by an AC circuit.

A

-AVERAGE/ACTIVE/REAL/TRUE POWER

33
Q

the power taken by a reactance (inductive or capacitive) in an AC circuit.

A

-REACTIVE/WATTLESS POWER

34
Q

the cosine of an angle between voltage and current in AC circuit.

A

-POWER FACTOR

35
Q

current remain in-phase with voltage real and apparent power arc equal purely passive load.

A

-UNITY PF

36
Q

current leads voltage by an angle electrical degree capacitive load.

A

-LEADING PF

37
Q

current lags voltage by anangle electrical degree inductive load.

A

-LAGGING PF

38
Q

there is a phase difference of 90 electrical degree between current and voltage, so no useful work done purely reactive load.

A

-ZERO PF

39
Q

there is a phase difference of 90 electrical degree between current and voltage, so no useful work done purely reactive load.

A

-ZERO PF

40
Q

purely inductive load. zero leading. purely capacitive load.

A

-ZERO LAGGING

41
Q

is the measure of its quality. The more perfect the inductor, the higehr its Q value.

A

-THE Q OF AN INDUCTOR

42
Q

the Q of a coil is also known as the

A

-MERIT OF A COIL

Review For Board Exam (17 decks)

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