# Sources Transformation - AC Circuits Flashcards

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

Practical Voltage Source

an ideal current source in parallel to an internal resistor Rp

Practical Current Source

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

Equivalent Practical Source

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

Maximum Power Transfer Theorem

maximum power formula:

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

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

Sinusoid

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

negative values

Sinusoidal current

circuits driven by sinusoidal current or voltage sources

AC Circuits

the angular frequency in radians/s

omega (w)

the argument of the sinusoid

omega(t) [wt]

the amplitude of the sinusoid

Vm

period of sinusoid

T

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

cyclic frequency f

phase

null sign

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.

graphical approach/graphical technique