Circuits Flashcards
Parallel resistance
(1/R + 1/R)^-1 = R
Series resistance
R + R = R
Ohmic
Linear
Conservation of Energy
Tip
Conservation of Electric Charge
Tip
- As you go across a circuit V=0
- One big loop
- Add smaller loops until every circuit element is touched
Kirchhoff’s Law
- V-IR-IR=0 (Make this equation for each loop)
- If you go through a battery from – to +, then I add the voltage
- If the direction of the loop is in the same direction as the I then subtract IR
- Sum of I
- Substitution
Loop rules
Capacitors block _ voltage.
DC
Each _ has a charge and its equal and opposite.
Plate
_ is how much charge you can store between the two plates.
Capacitance
_ is a material placed in between the plates of a capacitor that increases the capacitance (usually an insulator between two metal plates) and atoms are polarized and they align.
Dielectric
_ means dielectric.
Insulating
K = _ if its air.
1
When _ is open no more charge can move (Q is constant).
Switch
Series capacitance
(1/C + 1/C)^-1 = C
_ has same current.
Series
_ has same voltage.
Parallel
Parallel capacitance
C + C = C
Energy stored on a capacitor _ the work done to transfer the charge from one plate to the other.
Equals
Current follows the path of least _.
Resistance
Direction of current flows in the direction that the _ charge flow.
Positive
Only one path for current to flow
Series
Current is the same anywhere (Ia=Ib=Ic=…
Series
Total voltage drop equals the voltage of the battery (Vtotal=Va+Vb+Vc+…)
Series
The equivalent resistance equals the sum of the resistances of its parts (Rtotal=Ra+Rb+Rc+…)
Series
Voltage across any resistor in series is equal to the product of the ratio of that resistor to the total resistance and the total voltage (Va/Vb=Ra/Rb)
Series
More than one path of current flow
Parallel
Voltage is the same everywhere (Va=Vb=Vc=…)
Parallel
Total current is the sum of the currents through its branches (Itotal=Ia+Ib+Ic+…)
Parallel
Resistance is the reciprocal of the sum of the reciprocals of the resistors that are in the circuit (1/Rtotal=1/Ra+1/Rb+1/Rc+…)
Parallel