rotational speed
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rotational speed
A physical quantity that indicates how often an object rotates around its own axis within a specific unit of time. It is often measured in revolutions per minute (rpm).
Der Motor erreicht bei hoher Geschwindigkeit eine Drehzahl von 6000 Umdrehungen pro Minute.
At high speed, the engine reaches a rotational speed of 6000 revolutions per minute.
The word is a compound made from the stem of the verb 'drehen' (to turn/rotate) and the noun 'die Zahl' (number). So it literally means the 'number of rotations'.
Die Drehzahl gibt an, wie schnell sich der Motor dreht.
The rotational speed indicates how fast the engine is turning.
'Drehzahl' (rotational speed) is often used with the verbs 'erhöhen' (to increase), 'senken' (to lower), or 'regeln' (to regulate). Typical adjectives are 'hoch' (high), 'niedrig' (low), or 'konstant' (constant).
Beim Anfahren muss man die Drehzahl langsam erhöhen.
When starting, you have to increase the rotational speed slowly.
In a technical context, rotational speed is usually given in the unit 'Umdrehungen pro Minute' (revolutions per minute), often abbreviated as 'U/min' (rpm).
Die maximale Drehzahl dieses Geräts liegt bei 3000 Umdrehungen pro Minute.
The maximum rotational speed of this device is 3000 revolutions per minute.
frequency
Frequenz and Drehzahl both measure repetitions per unit of time. Frequenz is the general term for oscillations or other periodic processes. Drehzahl is specifically used for how often an object rotates around its own axis.
Der Techniker misst die Drehzahl des Motors in Umdrehungen pro Minute.
The technician measures the motor's rotational speed in revolutions per minute.
Der Techniker misst die Frequenz der elektrischen Schwingung in Hertz.
The technician measures the frequency of the electrical oscillation in hertz.
