The teacher is the sender and is sending the message through a face-to-face channel. She is encoding that she wants students to ask questions if they have any. A barrier to communication is the external noise coming from the classroom next door.
The class is so boring. What did the teacher said just now?
Receivers:The students
The students are the receivers. One of the students is decoding the message while another student has internal noise because he is not paying attention and didn't hear the question clearly.
Does she want us to ask questions?
Decoding
Feedback:The student responds to the question.
Channel:Face to face
How many elements are there in communication?
The student gives feedback by responding to the question. She sends the message through a face-to-face channel.