Useful constants:
![[useful constants]](formulas/constants1a.gif)
Binomial theorem:
![[binomial theorem]](formulas/binomial2a.gif){kind=small}
Gauss's law:
![[Gauss's law]](formulas/gauss1.gif)
Note that this is a surface integral!
Definition of electric potential
![[defn of potential]](formulas/potential2.gif)
Note that this is a line integral!
Electric field for a point charge:
![[E for a point charge]](formulas/E-point.gif)
Electric potential for a point charge:
![[V for a point charge]](formulas/V-point.gif)
Ohm's law
![[Ohm's law]](formulas/ohmdefn1.gif){kind=small}
Definition of capacitance:
![[defn of capacitance]](formulas/capdefn.gif){kind=small}
Resistance of a cylinder:
![[resistance of a cylinder]](formulas/resistivity.gif){kind=small}
Parallel-plate capacitance:
![[parallel-plate capacitance]](formulas/cap-plate.gif){kind=small}
Power delivered by battery
or dissipated by resistor
![[power]](formulas/power.gif){kind=small}
Electrical energy density
![[energy density]](formulas/energy-den.gif)
Energy stored by capacitor
![[energy in capacitor]](formulas/energy-cap.gif)
Resistors in series
![[series resistors]](formulas/R-series.gif){kind=small}
Capacitors in series
![[series capacitors]](formulas/C-series.gif)
Resistors in parallel
![[parallel resistors]](formulas/R-parallel.gif)
Capacitors in parallel
![[parallel capacitors]](formulas/C-parallel.gif){kind=small}
Capacitor charging by emf through resistor:
![[charging]](formulas/charging.gif){kind=small}
Capacitor discharging through resistor:
![[discharging]](formulas/discharging.gif){kind=small}