# Shared Flashcard Set

## Details

Physics-Circuits
Equations and topics on the MCAT
24
Physics
06/28/2020

Term
 Current Equation
Definition

I=Q/

### Δ

t

Term
 How does charge flow in a circuit?
Definition
 Charge flows from positive (higher potential) end to negative (lower potential) end
Term
 Kirchhoff's Law: Junction Rule
Definition
 The sum of currents going into a junction equals the sum of currents leaving the junction   ΣIinto the junction=ΣIout of the junction
Term
 Kirchhoff's Law: Loop Rule
Definition
 Sum of voltage sources equals the sum of voltage drops in a closed-circuit loop   ΣVsources=ΣVdrops
Term
 How do factors affect resistors?
Definition
 Increase in resistivity/length: Increase in resistance and conductance Increase in surface area: Decrease in resistance and conductance
Term
 Ohm's Law
Definition
 V=IR
Term
 Power
Definition
 P=IV P=I2R P=V2/R
Term
 Voltage of Resistors in Series
Definition
 Vs=V1+V2+V3+...+Vn
Term
 Resistance of Resistors in Series
Definition
 Rs=R1+R2+R3+...+Rn   Resistance will always increase as more resistors are added
Term
 Voltage of Resistors in Parallel
Definition
 Vp=V1=V2=V3=...=Vn   Electrons experience the same voltage drop with any path taken
Term
 Resistance of Resistors in Parallel
Definition
 1/Rp=1/R1+1/R2+1/R3+...+1/Rn   Rp=(R1R2...Rn)/(R1+R2+...+Rn)   Resistance will always decrease as more resistors are added
Term
 Capacitance Equation
Definition
 C=Q/V
Term
 Electric Field of a Capacitor
Definition
 E=V/d: where d is the distance between the plates
Term
 What is the direction of the electric field in a capacitors?
Definition
 Direction of electric field is from positive towards negative plate
Term
 Potential Energy Stored in a Capacitor
Definition
 U=CV2/2
Term
 Capacitance of a Capacitor with a Dielectric Material
Definition
 C'=kC: where C' is the new capacitance
Term
 Dielectrics in Isolated Capacitors
Definition
 When a dielectric material is introduced into an isolated capacitor, the increase in the capacitance results from a decrease in the voltage. (The charge with the dielectric material is the same as the charge w/o the dielectric material)
Term
 Dielectrics in Circuit Capacitors
Definition
 When a dielectric material is introduced into a circuit capacitor, the increase in capacitance arises from an increase in charge. (The voltage with the dielectric material is the same as the voltage w/o the dielectric material)
Term
 Capacitance of a Capacitor in Series
Definition
 1/Cs= 1/C1+1/C2+1/C3+...+1/Cn Cs=(C1C2C3Cn)/(C1+C2+C3+...+Cn)
Term
 Voltage of Capacitor in Series
Definition
 Vs=ΣVsources
Term
 Capacitance of Capacitor in Parallel
Definition
 Cp=C1+C2+C3+...+Cn
Term
 Voltage of Capacitors in Parallel
Definition
 Vp=Vsource
Term
 Circuit of a Resistor in Series
Definition
 Is=I1=I2=I3=In
Term
 Circuit of Resistor in Parallel
Definition
 Ip=I1+I2+I3+...+In
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