You mean where can i find the wiring diagram.
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A ring around wires in a wiring diagram most often represents a ring circuit in the wiring. A ring circuit is a wiring technique commonly seen in devices from the United Kingdom.
P means Electric Power
If you mean for the stero, check at www.installdr.com.
AV on wiring diagrams for construction refers to "audio-visual", i.e., sound and video cabling and accessories.
I assume you mean : will AC wiring carry DC, and the answer is yes. But many appliances require AC to work.
If you mean a pump wiring diagram, it depends what kind of pump you have, submersible or Jetpump. Both are very simple wiring and don't need a diagram. Both should be installed by a qualified well technician.
If you mean how do you connect it to the wiring, then you will need to find an adapter for the factory wiring in the car.
grooved wire mean earth wire smooth wire mean suply wire
Yes. Ground and Earth is the same thing.
"com" means common, very often the white or neutral conductor. On devices that have multiple wiring configurations it is the terminal used in all configurations.