
der Wecker
alarm clock
A clock or device that makes a sound at a preset time in order to wake someone up.
Mein Wecker hat heute Morgen um sechs Uhr geklingelt.
My alarm clock rang at six o'clock this morning.
alarm clock
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alarm clock
A clock or device that makes a sound at a preset time in order to wake someone up.
Mein Wecker hat heute Morgen um sechs Uhr geklingelt.
My alarm clock rang at six o'clock this morning.
The noun 'der Wecker' (alarm clock) is derived directly from the verb 'wecken' (to wake someone up). So a Wecker is literally an object that wakes someone up.
Kannst du mich morgen früh bitte wecken?
Could you please wake me up early tomorrow?
Three typical actions are associated with 'Wecker' (alarm clock): you can 'stellen' (set) the alarm clock, it 'klingelt' (rings) or 'geht los' (goes off) in the morning, and you can 'ausmachen' (turn it off).
Ich habe vergessen, den Wecker zu stellen.
I forgot to set the alarm clock.
When setting the time at which the alarm clock should ring, you use the preposition 'auf' followed by the accusative. You set the alarm clock 'auf' (for) a specific time.
Ich stelle meinen Wecker immer auf halb sieben.
I always set my alarm clock for six thirty.
alarm
Both words can refer to a device or signal that produces a sound. A „Wecker“ produces the signal at a set time so that someone wakes up; an „Alarm“, by contrast, warns of an immediate danger or disruption. For waking up in the morning, „Wecker“ is therefore the right word.

Mein Wecker klingelt morgen um sieben Uhr.
My alarm clock will ring at seven tomorrow morning.
Wegen des Feuers löste die Rauchmelderanlage im Haus Alarm aus.
Because of the fire, the smoke detector system in the building triggered the alarm.