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43 Cards in this Set
- Front
- Back
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Kirchoff Current Law, KCL?
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The currents around a node will algebraically sum to zero.
Sum of currents entering a node will equal sum of those leaving. |
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KVL, Kirchoff Voltage Law?
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The voltages around a closed path algebraically sum to zero.
Therefore, the sum of voltage rises = sum of drops. |
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Power
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Power = IV
Sum of all powers = 0 |
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R eq of a series?
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R1+R2 ... Rn
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Branch
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single two terminal element in a circuit.
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Node
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point of connection between two or more branches
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Branch equation?
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b = l + n -1
number of branches = loops + nodes - 1 |
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R eq for parallel circuits?
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R1(R2)/(R1+R2)
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Vab = -Vba
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voltage property.
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Vab = ?
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the change in work / the change in charge.
dw/dq |
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current i = ..
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dq/dt
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Charge Q = ..
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integral of idt from To to T
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Definition of charge
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an electrical property of atomic particles of which matter consists, measure in coulombs (C).
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Current (def)
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time rate of change of charge, meas in amperes (A).
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DC current, bro
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remains constant with time.
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AC current, homie
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changes with time. (think of sin graph)
varies sinusoidally. |
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1 amp = ?
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1 C / 1 s
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1 volt = ?
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1 joule / coulomb = 1 Nm/C
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Voltage (def)
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energy required to move a unit charge through an element
meas in volts, obviously. ;] |
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w formula?
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w = integ. (To, T) p dt.
or integ vi dt. |
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ideal indep. source
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active elem. that provides a specified voltage/current that is completely indep. of other circuit elements.
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ideal dependent source
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aka controlled source.
active elem. in which the source quantity is controlled by another voltage/current. |
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VCVS
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voltage-controlled voltage source
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CCVS
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current-controlled voltage source
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VCCS
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voltage-controlled current source
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CCCS
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current-controlled current source.
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e =
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-1.67 x 10^-19 C
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1 Ohm =
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1V / A
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Restistance
R = ? |
material density p * (length L/ cross-sectional area A)
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Ohm's Law?
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the voltage across a resistor is directly proportional to the current i flowing through the resistor.
V = iR |
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short circuit
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circuit elem. w/ resistance approaching zero.
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open circuit
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resistance of elem. approaching infinity.
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conductance G (def)
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a measure of how well an elem. will conduct electric current.
measured in mhos or siemens |
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G = ?
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1/R or
i/v |
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1 Siemen = ?
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1 mho = 1A / V
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i = ?
(using conductance G) |
i = Gv
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P = ?
without voltage |
P = (i^2) * R
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P = ?
without current. |
P = (v^2) / R
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P = ?
with conductance G? |
P = (v^2)G = (i^2) / G
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Voltage divider. (eq)
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V1 = V ( R1 / (R1 + R2) )
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Current divider. (eq)
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i1 = (R2 *i) / (R1 + R2)
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Voltage divider. (eq)
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V1 = V ( R1 / (R1 + R2) )
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Current divider. (eq)
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i1 = (R2 *i) / (R1 + R2)
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