Formulea - Ohm's Law

Ohm's Law [t-head1-first]



Resistance of a piece of wire
	Copper:
l = Length of conductor [m]	Aluminium:
χ = Conductivity [m/Ωmm²]	Iron:
A = Conductor cross section [mm²]	Zinc:
Resistances
Transformer
Capacitors
Impedance
L = Inductance [H]			f = Frequency [Hz]
C = Capacitance [F]			φ = Phase angle
X_L = Inductive impedance [Ω]
X_C = Capacitive impedance [Ω]
Parallel connection of resistances
With 2 parallel resistances:		With 3 parallel resistances:


General calculation of resistances: