this is a stupid question
neutral
In the UK the neutral wire is 'blue'.
blue and black
When ever there is a potential difference between it and ground.
you cut the yellow and black wire from the origanal plug and wire these from the CD player wire the yellow, red, blue, wire into the yellow and the black from origanal plug to black on CD player
Live Wire = usually brown, if not then its grey or black. Neutral Wire = Blue Earth Wire = green and yellow striped
Green with Yellow Stripe Wire - Earth Wire (E) Blue Wire - Neutral Wire (N) Brown Wire - Live Wire (L) When you look at the plug with the terminals facing towards you: /\ / \ / E \ / \ / \ / L N \ ------------------
A 'live' or 'hot' wire is a wire that is connected to a power source. This wire supplies voltage to a load ( light bulb, hair dryer, etc.). When the load is also connected a neutral or another live wire this becomes a path for the flow of current (amps) known as a circuit.
The green and yellow is the earth wire The brown is the live wire The blue is the neutral wire A poem to help is: The brown live cow drinks from the blue neutral water and eats the green grass from earth
Pull the wire off the spark plug, pull the spark plug out, plug the spark plug back into the wire, then have someone turn the engine over. You should see a blue spark jumping around the very bottom of the spark plug.
A blue wire preforms the same function as the 'hot' (black) wire. I believe that it is used for lower voltage circuits. (Please feel free to correct me if I am wrong on this.) Red, on the other hand, is found in some circuits where 240V is broken down into 117V applications (i.e. electric clothes dryers).Other than white (common) wire and Green (ground) wire, black is used as the primary load (hot) wire; different colored wires denote different circuits within an appliance.
They are all the exact same, all serving the same function. The different lengths are solely for convenience.