FEE Flashcards - Intro to AC Circuits (3)

1
Q

A signal that has the form of the sine or cosine function

A

Sinusoid

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2
Q

a sinusoidal current is usually referred to as ___

A

alternating current (AC)

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3
Q

This current reverses at regular time intervals and has alternately positive and negative values.

A

Alternating Current (AC)

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4
Q

Circuits driven by sinusoidal current or voltage sources

A

AC Circuits

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5
Q

In what ways do electricity flow

A

Direct Current (DC) Alternating Current (AC)

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6
Q

Difference between AC and DC in flow of eelctrons

A

DC: electrons move forward AC: Electrons switches forward and backward

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7
Q

Difference between AC and DC in cause of direction of elections

A

DC: Steady magnetism along the wire AC: Rotating magnet along the wire

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8
Q

Difference between AC and DC in Current

A

DC: Current is constant AC: Current varies with time

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9
Q

Difference between AC and DC in amount of energy carried

A

DC: Voltage cannot travel far AC: Safe to transfer over longer city distances

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10
Q

Difference between AC and DC in Frequency

A

DC: Frequency of current is 0 AC: 50 or 60Hz depending on the country

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11
Q

Where are AC and DC obtained from

A

DC: Cell or Battery AC: AC generator and mains

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12
Q

Passive parameters of AC and DC

A

DC: Resistance AC: Impedance

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13
Q

Power factors of AC and DC

A

DC: Always 1 AC: Between 0 and 1

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14
Q

the ratio of the real power that is used to do work and the apparent power that is supplied to the circuit.

A

Power Factor

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15
Q

Alternating voltage may be generated by?

A

(a) by rotating a coil in a magnetic field or (b) by rotating a magnetic field within a stationary coil

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16
Q

the resulting graph of an alternating current plotted to a base of time.

A

Waveform

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17
Q

It also refers to a time-varying waveform known as a sinusoidal wave or a generated sine wave.

A

AC Waveform

18
Q

Types of Waveform

A

sinusoidal wave, Half wave, Triangular wave, Semi-circular wave, Trapezoidal wave, Square wave

19
Q

One complete series of values

20
Q

One complete cycle is equivalent to

A

1 revolution

21
Q

The time taken in seconds for an alternating quantity to complete one cycle

A

Period or Periodic Time (T)

22
Q

Electromagnetic Induction formula

A

E(emf) = -N(dΦ/dt)

23
Q

Time period formula

A

T = 2π/ω or T = 1/f ; ω: Angular Velocity in rad/s

24
Q

Angular Velocity (ω) formula

25
The number of cycles completed per second
Frequency (f)
26
The standard frequency of the electricity supply in the Philippines
60 Hz
27
Frequency (f) formula
f = PN/120 or f = 1/T ; P: No. of pole/s ; N: speed in rpm ; T: Time in seconds
28
the voltage produced when a conductor winding in a magnetic field or by altering the direction of flux
emf
29
This is largest value reached in a half cycle (during positive or negative) of the waveform.
Max Value (or peak/crest value)
30
This is the average value measured over a half cycle
Ave Value (or mean value)
31
form factor formula
ff = rms/ave
32
peak factor
pf = max/rms
33
This is the current which will produce the same heating effect as an equivalent direct current
Effective (rms) value
34
It is sometimes called as root mean square (rms) value and whenever an alternating quantity is given, it is assumed to be the rms value
Effective value
35
For sine wave, form factor is equivalent to ___ while ___ for the peak factor.
1.11 ; 1.41
36
rms formula in sine wave
rms = max/√2
37
ave formula in sine wave
ave = 2max/π
38
the values of the alternating quantities at any instant of time or angle of rotation. They are represented by small letter.
Instantaneous values
39
sinusoidal voltage formula
e = Emsin(wt + θ)
40
sinusoidal current formula
i = Imsin(wt + θ)