Electric Circuits: AP Physics 2

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dielectrics in capacitors
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Terms in this set (21)
dielectrics in capacitors
insulating material between capacitor plates
increase capacitance
decrease electric field
equivalent resistance in parallel
1/Req = 1/R1 + 1/R2 + 1/R3
total resistance decreases and current increases , like increasing the area (versus series)
Image: equivalent resistance in parallel
equivalent resistance in series
Req = R1 + R2 + R3
total resistance increase and current decreases, like increasing the length (versus parallel)
Image: equivalent resistance in series
Ohm's Law
ΔV=IR
Image: Ohm's Law
resistivity
a material's opposition to the flow of electric current. p=RA/L
Image: resistivity
internal resistance
resistance of a battery (not ideal)
ΔVbatt=ε-Ir
current
flow of charge measured in Amperes. I=ΔQ/Δt
current in a series circuit
the same everywhere
current in a parallel circuit
shared between branches
Loop Rule
the Sum of changes in potential (voltage) around a closed loop is zero
Junction Rulethe sum of all currents entering a junction must equal the sum of the currents leaving (conservation of charge)Power (related to "brightness")P=IΔV or P=((ΔV)^2)/Relectromotive force (emf)εcapacitorstores charge-- becomes fully charged when its potential difference is equal to the battery's (i think)dielectric constantratio of field magnitude w/o dielectric to field magnitude inside dielectricequivalent capacitance in parallelCeq = C1 + C2 + C3 + ...equivalent capacitance in series1/Ceq = 1/C1 + 1/C2 + 1/C3 + 1/...capacitors at t=0uncharged and circuit acts like it's not present (so if it's on lone path, current would want to flow through it bc least resistance)ΔVbatt=ε-Irparallels y=mx+b ΔV=-rI+εnon-ohmicresistance not constant, usually through temperature change. graph of ΔV vs I would not be linear for deezvariable circuit componentsvalues can change