Red wire with black stripe positive or negative

The solid/dashed lines on wires like the ones pictured in your question are used to indicate polarity e.g. for the "wall wart" power supplies. Usually* the wire with the white stripe or the dashed lines carries the "positive" (+) end, while the other, unmarked wire carries the "negative" (-) end.

It doesn't matter if it is striped or dashed, the presence of any kind of marker is the indicator of the wire being the "positive" end of things, as opposed to the unmarked "negative" wire.

This kind of convention is used on speaker cables as well, where the wire that is marked in some manner (e.g. text providing wire information, a stripe, etc.) is the positive end, and the unmarked wire is the negative end.

*I say "usually" since I've seen a wall wart with the wires were reversed, although every other wall wart I've used does it the way I've described above. The only way to be sure is to use a voltmeter and measure the voltage across the two wires. If you get a negative voltage reading, you know you have the test leads swapped.

Is the Black stripe line along the entire outside housing of speaker wire meant for the Negative connection? What about if the speaker wire has a White stripe, is that for the Positive?

Typically the black stripe on speaker wire is for the Negative signal (black connection on speakers / Black receiver binding posts). The positive speaker wire is usually a solid color (or clear with no stripe). If there is a White stripe on speaker wire often times, this is wired to the Positive (Red connection / Red terminals) That being said, it really doesn't matter though, as long as the negative terminal of the receiver matches the negative terminal of the speaker (usually black, but never red). People usual wire speaker wire so that the marked black side is designated negative and the other wire is positive.

Gary Edwards

Best way to tell is , black to black and black is the negative, red is positive.

It's a common question, and there's no simple answer. The reason for this is that it is dependent on what the wire is used for and where it is used. The red wire is sometimes positive and sometimes negative.

To better understand how this works, consider the following scenarios in which the red wire could be positive or negative:

1. If you're working with electrical wiring in your home, the red wire is almost always going to be the positive wire.
2. On the other hand, if you're dealing with automotive wiring, the red wire is typically going to be the negative wire.
3. In some industrial applications, the red wire is used as a phase conductor for three-phase systems.
4. And finally, in some cases, the color of the wire doesn't necessarily indicate whether it's positive or negative. Instead, the polarity is determined by other factors, such as the direction of the current flow.

Finally, before making any assumptions about the polarity of the red wire, it's essential to recognize the type of system you're working with. If you have any doubts, always consult a qualified electrician or other professional before proceeding.

Checking Red wire with multimeter step-by-step guide:

It's simple and straightforward to check the red wire. You can test it in a few simple steps using only a multimeter.

1) Check that the multimeter is turned On.

2) Set the multimeter to resistance mode by turning the knob to the ohm symbol.

3) Connect the probes to the black and red wires. The black probe goes on the ground wire, while the red probe goes on the hot wire.

4) Turn on the multimeter by pressing the power button.

5) The display will show either a zero or infinity symbol. If it shows a zero, then there is continuity and the wire is positive. If it shows infinity, then there is no continuity and the wire is negative.

A multimetercan be used to test the red wire in just a few simple steps. To get accurate results, make sure to carefully follow the directions.

Frequently Asked Questions:

Is the red wire positive or negative?

It is positive if the red wire is connected. It is negative if it is not connected. To test this, set a multimeter to resistance mode and connect the probes to the black and red wires. If the screen displays "0," the wire is "positive," and if the number continues indefinitely, the wire is "negative."

Is it possible to start a fire using reverse polarity?

You may believe that the answer to this question is simple, but it is not. Even though reverse polarity can cause a spark, this spark is unlikely to be enough to start a fire.

A fire can be started by a variety of factors, including the type of fuel, the amount of oxygen, and the temperature. For a fire to start, all of these elements must be present in sufficient quantities. Sparks are insufficient to start a fire on their own. However, if the conditions are favorable, a spark can start a fire. So, starting a fire with reverse polarity is possible.

Is the red wire always positive?

No, the positive wire is not always the red wire. Depending on the circuit, the red wire could be either positive or negative. Always refer to the schematic to determine which wire goes where.

What happens if you mix up the hot and neutral wires?

When you mix up the hot and neutral wires, it's called a "reverse polarity" condition. This can happen if you accidentally connect the black (hot) wire to the white (neutral) terminal on an outlet, or if you connect two hot wires.

If you have a reverse polarity condition, it's not necessarily dangerous. However, it can cause electrical devices to work improperly or even malfunction. Additionally, it wastes electricity because some of the current will flow through the unused circuit back to the power source.

To correct a reverse polarity condition, simply switch the hot and neutral wires around so they are connected to the proper terminals. If you're not sure which wire is which, you can use a circuit tester or multimeter to test the wires before switching them.

What happens if you mix up the hot and neutral wires?

A "reverse polarity" condition occurs when the hot and neutral wires are mixed. This can occur if you connect the black wire to the white terminal on an outlet by accident, or if you connect two hot wires. It is not always dangerous to have a reverse polarity condition. It can, however, cause electrical devices to work incorrectly or even fail.

Simply switch the hot and neutral wires around so they are connected to the correct terminals to correct a reverse polarity condition. If you don't know which wire goes where you can use a circuit tester or multimeter to find out before you switch them.

Conclusion:

In general, red wires are used to indicate positive voltage, while black wires are used to indicate negative voltage. However, this is not always the case, so it is important to check your specific application before making any assumptions. If in doubt, always consult a qualified electrician.

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