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43 Cards in this Set
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Kirchoff Current Law, KCL?

The currents around a node will algebraically sum to zero.
Sum of currents entering a node will equal sum of those leaving. 

KVL, Kirchoff Voltage Law?

The voltages around a closed path algebraically sum to zero.
Therefore, the sum of voltage rises = sum of drops. 

Power

Power = IV
Sum of all powers = 0 

R eq of a series?

R1+R2 ... Rn


Branch

single two terminal element in a circuit.


Node

point of connection between two or more branches


Branch equation?

b = l + n 1
number of branches = loops + nodes  1 

R eq for parallel circuits?

R1(R2)/(R1+R2)


Vab = Vba

voltage property.


Vab = ?

the change in work / the change in charge.
dw/dq 

current i = ..

dq/dt


Charge Q = ..

integral of idt from To to T


Definition of charge

an electrical property of atomic particles of which matter consists, measure in coulombs (C).


Current (def)

time rate of change of charge, meas in amperes (A).


DC current, bro

remains constant with time.


AC current, homie

changes with time. (think of sin graph)
varies sinusoidally. 

1 amp = ?

1 C / 1 s


1 volt = ?

1 joule / coulomb = 1 Nm/C


Voltage (def)

energy required to move a unit charge through an element
meas in volts, obviously. ;] 

w formula?

w = integ. (To, T) p dt.
or integ vi dt. 

ideal indep. source

active elem. that provides a specified voltage/current that is completely indep. of other circuit elements.


ideal dependent source

aka controlled source.
active elem. in which the source quantity is controlled by another voltage/current. 

VCVS

voltagecontrolled voltage source


CCVS

currentcontrolled voltage source


VCCS

voltagecontrolled current source


CCCS

currentcontrolled current source.


e =

1.67 x 10^19 C


1 Ohm =

1V / A


Restistance
R = ? 
material density p * (length L/ crosssectional area A)


Ohm's Law?

the voltage across a resistor is directly proportional to the current i flowing through the resistor.
V = iR 

short circuit

circuit elem. w/ resistance approaching zero.


open circuit

resistance of elem. approaching infinity.


conductance G (def)

a measure of how well an elem. will conduct electric current.
measured in mhos or siemens 

G = ?

1/R or
i/v 

1 Siemen = ?

1 mho = 1A / V


i = ?
(using conductance G) 
i = Gv


P = ?
without voltage 
P = (i^2) * R


P = ?
without current. 
P = (v^2) / R


P = ?
with conductance G? 
P = (v^2)G = (i^2) / G


Voltage divider. (eq)

V1 = V ( R1 / (R1 + R2) )


Current divider. (eq)

i1 = (R2 *i) / (R1 + R2)


Voltage divider. (eq)

V1 = V ( R1 / (R1 + R2) )


Current divider. (eq)

i1 = (R2 *i) / (R1 + R2)
