Line out jack

[Sankar]

I am new to electronics
I wonder how line out jack (rca) functions ? I cant hear when I
connect my speakers directly to my TV's line out. But when connected
to line in of my system it receives audio. What is the principle used
?

Thanx in Advance
Sankar

 

[Herbert West]

I am new to electronics
I wonder how line out jack (rca) functions ? I cant hear when I
connect my speakers directly to my TV's line out.

The signal at this point is in millivolts ans lacks sufficient power
to drive a load.

But when connected
to line in of my system it receives audio. What is the principle used?

Amplification.

The Line In is the input to a stage which amplifies the signal to a
level of sufficent power to drive larger loads, e.g. speakers.

 

[Joseph]

unless your speakers equip with an amplifer, you need to connect the TV line
out to an amplifier line in. The signal need to be amplified to push the
speakers.