Term

Definition
produces current ΔV = &  IR battery is nearly constant voltage source but the small resistance reduces the voltage 


Term

Definition
current stays the same, voltage splits V = V_{1}+V_{2}+V_{3}=IR_{1}+IR_{2}+IR_{3} R_{eq}=R_{1}+R_{2}+R_{3} 


Term

Definition
splits current, voltage stays the same I=I_{1}+I_{2}+I_{3} V/R_{eq}=V/R_{1}+V/R_{2}+V/R_{3} 1/R_{eq}=1/R_{1}+1/R_{2}+1/R_{3} 


Term
Kirchhoff's Rules: Junction Rule Loop Rule 

Definition
JR=sum of the currents entering equals sum fo currents leaving LR=sum of changes in potential around a closed loop is 0 


Term
Charging a battery: emfs in series and batteries lined up 

Definition
voltage = Σseparate voltages 


Term
Charging a battery: emfs in series and batteries not lined up 

Definition
total voltage = difference in voltages; lower voltage battery is charged 


Term
Charging a battery: emfs in parallel 

Definition
voltages must be the same 


Term
Capacitors in parallel (3) 

Definition
same voltage across each capacitor C_{eq}V = C_{1}V+C_{2}V+C_{3}V=(C_{1}+C_{2}+C_{3})V C_{eq}=C_{1}+C_{2}+C_{3} 


Term

Definition
all have the same charge Q/C_{eq}=Q/C_{1}+Q/C_{2}+Q/C_{3}=Q(1/C_{1}+1/C_{2}+1/C_{3}) 1/C_{eq}=1/C_{1}+1/C_{2}+1/C_{3} 


Term

Definition
capacitor charges when switch is closed voltage and charge increases with time: V_{C}=&(1e^{t/RC}) Q=Q_{0}(1e^{t/RC}) 


Term

Definition
capacitor discharges Q=Q_{0}e^{t/RC} 


Term

Definition
even small currents are dangerous (10 mA) voltage can be lethal if you are wet and touching the ground safest prongs are 3pronged b/c they have a ground line 


Term
Ammeter (2) voltmeter (2) ohmmeter galvanometer (2) 

Definition
measures current, needs low resistance to not interfere with current, connect in series to measure resistance measures potential, should not effect voltage so resistance must be large, connect in parallel to measure resistance measures resistance, need a battery to produce current deflection of needle is proportional to current flowing through it, uses torque to measure current 


Term

Definition
transforms energy from some other form to electrical energy 


Term
Resistors in Series Resistors in Parallel Capacitors in Series Capacitors in Parallel 

Definition
R_{eq}=R_{1}+R_{2}+R_{3} 1/R_{eq}=1/R_{1}+1/R_{2}+1/R_{3} 1/C_{eq}=1/C_{1}+1/C_{2}+1/C_{3} C_{eq}=C_{1}+C_{2}+C_{3} 1Pre, 1Sec 


Term
3 resistors, 4 Ω each, 4 scenarios and equivalent resistances 

Definition


Term

Definition
When part of a circuit with the most resistance is bypassed, and all of the current flows through the part with zero/negligible resistance 

