Current
Kirchhoff’s junction rule
Iinto junction = Ileaving junction
Kirchhoff’s loop rule
Vsource = Vdrop
Definition of resistance
Ohm’s law
V = IR
Voltage and cell emf
V = Ecell – irint
Definition of power
Electric power
Voltage drop across circuit elements (series)
Vs = V1 + V2 + V3 + ⋯ + Vn
Equivalent resistance (series)
Rs = R1 + R2 + R3 + ⋯ + Rn
Voltage drop across circuit elements (parallel)
Vp = V1 = V2 = V3 = ⋯ = Vn
Equivalent resistance (parallel)
Definition of capacitance
Capacitance based on parallel plate geometry
Electric field in a capacitor
Potential energy of a capacitor
Capacitance with a dielectric material
C′ = κC
Equivalent capacitance (series)
Equivalent capacitance (parallel)
Cp = C1 + C2 + C3 + ⋯ + Cn