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43 Cards in this Set

  • Front
  • Back
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 = IV

Sum of all powers = 0
R eq of a series?
R1+R2 ... Rn
single two terminal element in a circuit.
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?
Vab = -Vba
voltage property.
Vab = ?
the change in work / the change in charge.

current i = ..
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.
voltage-controlled voltage source
current-controlled voltage source
voltage-controlled current source
current-controlled current source.
e =
-1.67 x 10^-19 C
1 Ohm =
1V / A

R = ?
material density p * (length L/ cross-sectional 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

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)