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# Formelsammlung Elektrotechnik: Themengebiete

### Ohmsches Gesetz

Formelzeichen Einheit
U = Spannung V = Volt
I = Stromstärke A = Ampère
R = Widerstand Ω = Ohm
 ${\displaystyle R={\frac {U}{I}}}$ ${\displaystyle [R]={\frac {V}{A}}=\Omega }$ ${\displaystyle I={\frac {U}{R}}}$ ${\displaystyle [I]={\frac {V}{\Omega }}=A}$ ${\displaystyle U=I\cdot R}$ ${\displaystyle [U]=A\cdot \Omega =V}$

### Spannung

Formelzeichen Einheit
U = Spannung V = Volt
W = Arbeit Ws Wattsekunde J = Joule
Q = Ladung C = Coulomb
I = Stromstärke A = Ampère
t = Zeit s = Sekunden
 ${\displaystyle U={\frac {W}{Q}}}$ ${\displaystyle [U]={\frac {Ws}{As}}=V}$ ${\displaystyle U={\frac {W}{I\cdot t}}}$ ${\displaystyle [U]={\frac {Ws}{A\cdot s}}=V}$

Formelzeichen Einheit
I = Stromstärke A = Ampère
Q = Ladung C = Coulomb
t = Zeit s = Sekunden
 ${\displaystyle I={\frac {Q}{t}}}$ ${\displaystyle [I]={\frac {C}{s}}={\frac {As}{s}}=A}$ ${\displaystyle Q=I\cdot t}$ ${\displaystyle [Q]=A\cdot s=C}$

### Leistung

Formelzeichen Einheit
W = Arbeit Ws Wattsekunde J = Joule
U = Spannung V = Volt
I = Stromstärke A = Ampère
t = Zeit s = Sekunden
P = Leistung W = Watt
R = Widerstand Ω = Ohm
 ${\displaystyle P=U\cdot I}$ ${\displaystyle [P]=V\cdot A=W}$ ${\displaystyle P={\frac {W}{t}}}$ ${\displaystyle [P]={\frac {Ws}{s}}=W}$ ${\displaystyle P={\frac {U^{2}}{R}}}$ ${\displaystyle P={I^{2}}\cdot {R}}$

### Arbeit

Formelzeichen Einheit
W = Arbeit Ws Wattsekunde J = Joule
U = Spannung V = Volt
I = Stromstärke A = Ampère
t = Zeit s = Sekunden
P = Leistung W = Watt
Q = Ladung C = Coulomb
 ${\displaystyle W=U\cdot I\cdot t}$ ${\displaystyle [W]=V\cdot A\cdot s=Ws}$ ${\displaystyle W=P\cdot t}$ ${\displaystyle [W]=W\cdot s=Ws}$ ${\displaystyle W=U\cdot Q}$ ${\displaystyle [W]=V\cdot C=Ws}$