The article will consider information about whether the black wire is plus or minus. If there are no special devices at hand, then how to determine the polarity of the wires. Consider, using the example of a radio, how to determine the polarity.
How to determine the polarity?
Not always there are signs on the devices. How to determine the plus and minus on the wires? You can quickly find out with a multimeter. And if it is not there and you urgently need to supply power or start a car? If the wires are connected incorrectly, the device or power source can easily fail. Therefore, it is important to correctly determine the polarity.
Let's look at the example of connecting acoustics to the radio. There is a quick and easy way to determine the phasing to connect speakers. This requires a simple Chinese multimeter.
You need to turn on the music on the device so that a signal goes to the speakers. Set the multimeter to the smallest voltage value.
Disconnect the cable from the speaker and touch it with the pointer of the multimeter. We connect "+" to the red wire, "-" to the black wire. If the connection is correct,multimeter will display the value with the sign "-".
Conclusion
Here's a simple way to help determine the correct phasing. On the radio, the polarity may be confused at the factory, especially in cases where the marking is not indicated. Then you will have to independently determine where is the minus and where is the plus.
When you get the polarity correct, the problem is solved! To facilitate the task, instructions from musical equipment will come to the rescue, where you can easily find the correct conclusions according to the diagram. If the wires are black and red, then black is usually "-". In order to check the correct connection, you can apply a weak signal to both channels. If there is no bass, the connection is not correct.
If you have not figured out whether the black wire is positive or negative, then it is better to contact specialists.
