A doorbell is called a doorbell because it is a bell for your door.
a computer on the whole is a system ... it has a lot of subsystems .. these subsystems are said to be the computer subsystem ... thus in simple words , a subsystem found in a computer system is said to be a "Computer Subsystem"
Subsystems but no definitions... housing,
doorbell
A doorbell A telephone
what area the three subsystems of culture
I did not answer the door because the doorbell is broken.
A subject is found at the front of the sentence before the verb. However, a sentence structure can hide a subject if the sentence begins with a clause. For example: When the doorbell rang, my dog barked and whined. Dog is the subject in that sentence, despite that doorbell is a noun.
Some subsystems (parts) are:ScrewsWheel and AxelhandleMetalBladeGearsLever
Doorbell was invented by Joseph Henry in 1831.
My Doorbell was created on 2005-09-03.
"I rang the doorbell" is correct. "Rung" is the past participle of "ring," not the past tense form used in this context.