Usually, in a 12 VDC system, the red is the positive lead and the black is the negative lead - but to be sure, it's best to use a multimeter or a volt meter.
black
In the hot tub junction control box there should be three terminals. The terminal block might say line voltage. This is where the incoming "hot" wires connect. The red and black wires will probably be for the 240 volt pump motor and one of the two "hot" wires and the white wire will be used for the controls that control the pump.
Where there is a red wire involved that usually indicates some type of special switching arrangement or more likely a 240 Volt circuit. In this case there will be 240 volts across the red and black and they will both be hot. Normally for 120 Volts the black is hot, the white is common and the bare wire is ground.
In a DC application, black is always Negative, so the white wire would be +12v and black would be Negative.
Red is positive while Black is negative.
black
Depending on the configuration of the cord cap, the green wire is ground, the white wire is the neutral and red and black wires are the 220 volt source.
In the hot tub junction control box there should be three terminals. The terminal block might say line voltage. This is where the incoming "hot" wires connect. The red and black wires will probably be for the 240 volt pump motor and one of the two "hot" wires and the white wire will be used for the controls that control the pump.
black
Where there is a red wire involved that usually indicates some type of special switching arrangement or more likely a 240 Volt circuit. In this case there will be 240 volts across the red and black and they will both be hot. Normally for 120 Volts the black is hot, the white is common and the bare wire is ground.
The colour red designates that the wire is used as a live wire. The neutral wire is identified as white in colour.
In residential wiring the white wire is neutral on the 120 volt circuits. On a 3way circuit the red is the traveler and the white is neutral. On a 240 volt 3 wire connection the white & black are hot. On a 240 volt 4 wire connection the black and red are hot and the white is neutral.
No, internal PC wiring colors do not correspond to the standard AC wiring colors. Computer power supplies provide direct current to the computer and peripherals. When using direct current, the black wire is the ground wire. The red wire to the peripheral supply cables are 5 volt, and the yellow wire is 12 volt. Some SATA power connectors have an orange wire that is 3.3 volt.
It is the ground wire for the fuel pump. The Red wire is the power wire for the pump. the dark blue is the signal wire for the gauge and the black is the ground for the gauge.
In the US of A, it's supposed to be black.
In a DC application, black is always Negative, so the white wire would be +12v and black would be Negative.
Red is positive while Black is negative.