I did not answer the door because the doorbell is broken.
He rung the doorbell.
ask a classmate for help
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.
A doorbell is called a doorbell because it is a bell for your door.
doorbell
I rang the doorbell repeatedly, but no one answered.
A doorbell A telephone
To install a Ring doorbell with an existing doorbell system, you will need to follow these steps: Turn off the power to your existing doorbell system at the circuit breaker. Remove your old doorbell button and disconnect the wires. Install the Ring doorbell according to the manufacturer's instructions, connecting it to the existing doorbell wires. Turn the power back on and follow the setup instructions for your Ring doorbell. By following these steps, you can successfully install a Ring doorbell with an existing doorbell system.
"You rang the doorbell" is an indepent clause, because it can exist on its own. So is "but no one answered," because it is using a coordinating conjunction, which acts as a independent marker for an independent sentence. See https://owl.english.purdue.edu/owl/resource/598/01/.
To install a Ring doorbell without an existing doorbell, you can use a Ring Video Doorbell that is battery-powered. Simply mount the doorbell, connect it to your Wi-Fi network, and follow the setup instructions in the Ring app to complete the installation.
The recommended voltage requirement for a doorbell system powered by a 24V doorbell transformer is 24 volts.
Doorbell was invented by Joseph Henry in 1831.