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Basic Electricity Final > AC > Flashcards

AC Flashcards

0
Q

Direct Current

A

Is a form of current electricity where the polarity of the source does not change.

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1
Q

_____________ are binary circuits which have one of two possibilities.

A

Logic circuits

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2
Q

Define inductance:

A

Inductance is the property of electricity that opposes change in current due to a change in the electromagnetic field caused by the current.

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3
Q

Define one time constant, with respect to inductance.

A

The amount of time it takes for 63.2% of total current to flow in a circuit.

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4
Q

Define capacitance:

A

Capacitance is energy stored in an electrostatic field.

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5
Q

How is total capacitance found in series? In parallel?

A

Series: inverse sum of the inverses

Parallel: the sum of the individual capacitors.

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6
Q

Alternating current:

A

A form of current electricity where the polarity of the source periodically changes.

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7
Q

What are the three common forms of AC?

A

Square wave, saw tooth wave, sine wave.

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8
Q

Electromagnetic induction:

A

The creation of an electrical potential in a conductor by passing that conductor through lines of magnetic flux.

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9
Q

On what principle is sine wave produced?

A

The principle of electro magnetic induction.

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10
Q

What happens in square wave AC?

A

Polarity periodically changes, but value does not.

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11
Q

What happens in sine wave AC?

A

Polarity periodically changes, value changes based on sine function.

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12
Q

What happens in saw tooth wave AC?

A

Polarity periodically changes, value changes with straight line variation.

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13
Q

What two things determine the polarity of the potential produced by electromagnetic induction?

A

The orientation of the lines of flux

The direction the conductor is cutting the lines of flux

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14
Q

How can the potential produced by electromagnetic induction be increased?

A

Increase the strength of the flux field being cut

Increase the rate at which the lines of flux are being cut.

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15
Q

What are the advantages of AC over DC?

A

It is much easier to generate large quantities, it is easier to change values without substantial power loss, and it is much easier to transfer over long distances.

16
Q

What is a disadvantage of AC?

A

It is not as efficient as DC.

17
Q

Alteration:

A

One half of a cycle, either in the positive or negative direction.

18
Q

Period:

A

The time measured for one cycle to occur, measured in seconds.

19
Q

Frequency:

A

The number of cycles per second, measured in hertz.

20
Q

Out of phase:

A

Any condition other than in phase

21
Q

Phase shift:

A

The amount current and voltage are out of range, in degrees of conductor rotation.

22
Q

Apparent power:

A

The amount of power that would be dissipated in a d.c. Circuit.

23
Q

True power:

A

The amount of actual power dissipated in an AC circuit.

24
Q

Power factor:

A

The ratio of true power to apparent power.

25
Q

Peak to peak value:

A

The maximum difference between the positive peak and the negative peak value.

26
Q

How is phase shift measured?

A

Degrees of conductor rotation?

27
Q

As current increases the magnetic field _________?

A

Increases (expands)

28
Q

As current decreases, the magnetic field ___________.

A

Decreases, collapses

29
Q

If current flow reverses, the flux field also ______.

A

Reverses

30
Q

Capacitive circuit efficiency?

A

Least efficient

31
Q

Resistive circuit efficiency?

A

Most efficient circuit

32
Q

Inductive circuit efficiency?

A

Least efficient

33
Q

Resonance circuit efficiency?

A

Most efficient.

34
Q

How to make a circuit resonant?

A

Change the amount of inductance in the circuit
Change the amount of capacitance in the circuit
Change the frequency of the circuit

35
Q

Three phase electricity?

A

A form of AC which had three separate current and voltage sine waves.

36
Q

What are the types of three phase windings?

A

Wye wound, delta wound

Basic Electricity Final (1 decks)

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