Sources Transformation - AC Circuits

Question 1

an ideal voltage source in series with an internal resistor, Rs

Answer 1

Practical Voltage Source

Question 2

an ideal current source in parallel to an internal resistor Rp

Answer 2

Practical Current Source

Question 3

if two practical sources produces the identical values of voltage (Vl) and current (Il) when they are connected to a identical values of Rl

Answer 3

Equivalent Practical Source

Question 4

An independent voltage source in series with a resistance, or an independent current source in parallel with a resistance, delivers a maximum power to load resistance Rl for which Rl=Rs

Answer 4

Maximum Power Transfer Theorem

Question 5

maximum power formula:

Answer 5

Pmax = Vs^2/4Rs = Vth^2/4Rth

Question 6

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

Answer 6

Sinusoid

Question 7

• usually referred to as alternating current (ac)
• a current that reverses at regular time intervals and has alternately positive and
  negative values

Answer 7

Sinusoidal current

Question 8

circuits driven by sinusoidal current or voltage sources

Answer 8

AC Circuits

Question 9

the angular frequency in radians/s

Answer 9

omega (w)

Question 10

the argument of the sinusoid

Answer 10

omega(t) [wt]

Question 11

the amplitude of the sinusoid

Answer 11

Vm

Question 12

period of sinusoid

Answer 12

T

Question 13

The reciprocal of this quantity is the number of cycles per second, known as…

Answer 13

cyclic frequency f

Question 14

phase

Answer 14

null sign

Question 15

A ____________may be used to relate or
compare sinusoids as an alternative to using the
trigonometric identities. Also, can be used to add
two sinusoids of the same frequency when one
is in sine form and the other is in cosine form.

Answer 15

graphical approach/graphical technique

Question 16

frequency formula

Answer 16

f = 1/T

Question 17

period formula:

Answer 17

T = 2(pie)/omega

Question 18

a complex number that represents the amplitude and phase of a sinusoid

Answer 18

Phasor

Question 19

rectangular form of phasor

Answer 19

z = x + jy

Question 20

polar or exponential form of phasor

Answer 20

z = r∠∅ = re^j∅

Question 21

is thus the phasor representation of the sinusoid v(t).

Answer 21

V

Question 22

complex conjugate

Answer 22

z∗ = x − jy = r∠ − ∅ = re^−j∅

Question 23

time domain representation

Answer 23

v(t) = Vm cos(ωt + ∅)

Question 24

phasor domain representation

Answer 24

V = Vm∠∅

Question 25

the instantaneous or time domain representation

Answer 25

v(t)

Question 26

the frequency or phasor domain representation.

Answer 26

V

Question 27

time dependent

Answer 27

v(t)

Question 28

phasor

Answer 28

V = RIm∠∅

Question 29

The ______________ of a circuit is the ratio of the phasor voltage V to the phasor current I, measured in _____________

Answer 29

impedance Z, ohms (Ω)

Question 30

It represents the opposition that the circuit exhibits to the flow of sinusoidal current.

Answer 30

impedance

Question 31

The ___________ is the reciprocal of impedance, measured in ____________

Answer 31

admittance Y, siemens (S).

Question 32

The ________of an element (or a circuit) is the ratio of the phasor current through it to the phasor voltage across it,

Answer 32

admittance Y