01
das Ohm
ohm
The physical unit of measurement for electrical resistance. The symbol is the Greek omega (Ω).
example
Diese Glühbirne hat einen Widerstand von 200 Ohm.
This light bulb has a resistance of 200 ohms.
das Ohm
ohm
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Meanings
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Usage tips
Use as a unit of measurement
When 'Ohm' (ohm) is used as a unit of measurement together with a number, it remains unchanged in the plural. So you say 'zehn Ohm' (ten ohms), not 'zehn Ohme'.
EXAMPLE
Der Widerstand hat einen Wert von 500 Ohm.
The resistance has a value of 500 ohms.
Symbol notation
In technical and physics texts, the Greek symbol omega (Ω) is almost always used for 'Ohm' (ohm). It is important to recognize this symbol.
EXAMPLE
Auf dem Gerät steht: R = 150 Ω.
The device says: R = 150 Ω.
Context clue: physics
This meaning of 'Ohm' (ohm) occurs exclusively in the technical language of physics and electrical engineering. Typical words in its context are 'Widerstand' (resistance), 'Spannung' (voltage), and 'Strom' (current).
EXAMPLE
Um den Widerstand in Ohm zu berechnen, teilt man die Spannung durch die Stromstärke.
To calculate the resistance in ohms, you divide the voltage by the current.
Historical context
The meaning as a unit of liquid capacity is outdated today. You only find it in historical texts, often in connection with wine or other liquids.
EXAMPLE
In dem alten Dokument war von einem Fass mit 10 Ohm Wein die Rede.
The old document mentioned a barrel with 10 ohms of wine.
Compare with
Ohm vs Widerstand
resistance
'der Widerstand' and 'das Ohm' both belong to the field of electricity. 'der Widerstand' is the property that impedes electric current. 'das Ohm' is the unit used to measure this electrical resistance. The words can be confused because they occur in the same technical context. In practical terms: resistance is the quantity, ohm is the unit of measurement.
Ohm
Dieser kleine Bauteil hat einen Wert von 220 Ohm.
This small component has a value of 220 ohms.
Widerstand
Der Techniker misst den Widerstand des Kabels.
The technician measures the resistance of the cable.
In real life
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