# Tagged Questions

A length of conductive material used as a conductor of electricity.

338 views

### Large Wires on a Perfboard

I am working on a project on Perfboard which involves controlling a motor that draws about 10A, and I am using 18AWG stranded wire to connect the MOSFET on board to the battery and motor which are off ...
3k views

### Which wire gauge for a 250 amp source?

I have no real experience with this stuff... I have two 6V 220Ah DC golf cart batteries that I want to put in series to make a 12V 220Ah output that I will connect to a 3000W power inverter, my ...
269 views

### Why is voltage higher at positive wire instead of negative wire in this example?

If electrons travel from "-" to "+" and voltage decrease going through resistor why is voltage higher at positive wire instead of negative wire?
801 views

### Understanding ground symbol

If ground is a reference point and it is not physically connected how can it protect someone touching the wire from electric shock (I probably misunderstand what that symbol really means)
201 views

### How current flows

I've read about how current flows and I am confused. I probably don't understand it correctly so I am asking 2 questions If I connect 2 charged sides of battery by copper wire and I touch that wire ...
104 views

### Understanding current flow in example

When I have series circuit with 3 light bubbles the voltage in second should be less than in first and the voltage in third should be less than in second. Conventional current flow is from positive to ...
690 views

### How durable is the insulation on magnet wire?

I'm planning a light sculpture. It will consist of a large number of RGB LEDs mounted on a tree-like galvanized steel frame. Each LED has four wires -- GND, +5V, data-in and data-out. For aesthetic ...
100 views

### Calculate delay in long line

Assume we are connecting a lamp to a source but line (wire) is so long (for example 20Km): Will the lamp bright after connecting the source immediately? how much time it will be? Can we calculate ...
232 views

### Why is speaker wire so thick? [duplicate]

Comparable to standard house wire, which carries much more current for powering high power devices like vacuum cleaners etc, speaker wire seems to be unusually thick, and tends to be stranded, which ...
271 views

### Calculate gauge of wire with voltage and current

I would like to figure out these two things: X gauge of wire needed dependent on the current needed, and the length. X max length of wire dependent on the current, and the gauge.
602 views

### Current capacity of copper wires in vacuum

I’d like to know the current carrying capacity of copper wires in vacuum. The current plan (NPI) calls for sending ~3 amps through the vacuum space of a cryostat. Has anyone done this? Have any ...
350 views

### Assembling JST PH connectors

I assembled a few JST PHR-4 connectors with wires (manually crimped SPH-002T-P0.5S crimp terminals with AWG24 wires and inserted it into the PHR-4 connector housing). When I tried to join connector ...
87 views

### Need assistance in identifying wire

I'm working on a LED project similar to the one in the picture, and I need to identify the black wire that the arrows are pointing to. What are those called? Here is a picture:
185 views

### I just bought a one-earbud headset with a microphone, but the jack is too small! I cut it open, what do the wires do? [closed]

So, yeah, this is my first question, yay, but I still have a problem, boo. I was on a rummage sale spree, so-to-speak, looking for a new pair of earbuds as yet another cheapie pair has broken. I ...
155 views

### Why is the led that I hooked up with my laptop blinking?

I connected a led to my laptop through a USB cable. I connected the red wire to the positive end of the LED and the black wire to the negative and of the LED. Why does the led keep blinking (pulsing) ...
2k views

### What kind of metal are the legs of resistors made from?

Can anyone tell me what kind of metal is used in electronics to make wires going in/out to the elements? Can longer of this metal wire be found anywhere? Actually I am looking for sth like copper wire ...
859 views

### Transmitting 12v DC over a long wire

I'm trying to charge my laptop through a 12V battery and 12-19V adapter over a long wire but I've noticed that the adapter makes some noise and doesn't work. On the other hand when I connect it close ...
136 views

### What is the mechanism by which corona discharge damages wire insulation?

I understand that corona discharge can damage wire insulation over time. How? What exactly is happening to the insulation that it ceases to become so insulative?
2k views

### How to best run long distance low voltage electric

I am looking into options for running 12 VDC approximately 2000 feet to power some remote equipment. The equipment will have a low current draw (2A max). I am seeking to keep the cost low. Copper ...
15k views

### Will doubling thinner wire in lieu of thicker wire work?

I've been needing a jumper cable for a while and have plenty of 10 AWG copper wire lying around. From what I've read, 6 AWG wire is recommended for jumper cables. I want to make a 7 foot cable. So, ...
274 views

### How to strip wire using Wire Wrapping Tool from OK Industries

For learning wire wrapping, I have a wire wrapping/unwrapping tool from OK Industries (HW-UW-3C) and some 30 AWG wire wrapping wire. Is it possible to use this tool to strip the wire?
242 views

### Headphone wires without insulation

I have some quality earbuds that have no sheath on the wires, because the copper unwinds all by itself, it's held in some thin nylon loose fibres that acts as the insulating material. it's seems very ...
204 views

### Name of socketed PCB jumpers

What is the correct name for those little jumper cables, with a small socket each end, designed to go between header pins on PCBs. A bit like these, but singles http://www.ebay.co.uk/itm/5-Pcs-30cm-...
2k views

### How do I “cap” a wire so it doesn't short or electrocute someone?

I'm repurposing a PSU that I recently replaced. I'm using it in a project that needs high current supplied. I don't need all the wires (as you could imagine), but I don't know how to seal them off ...
7k views

### Which wire is negative on this PC fan? [closed]

I just got this PC fan and it has a 3 pin connector, I know the wire with the white stripe is positive but how can I find out which of the other two wires are negative? If you can't see the photo, ...
2k views

### How do I tell what gauge wire I need?

I've been working on providing power for high current applications for my project. I'm working on a project with high current (or at least compared to what I'm used to...) What a lot of people point ...
1k views

### Does the gauge of wire make any difference when wiring the inside of an electric guitar?

I'm replacing some of the electronics inside my electric guitar. I have some wire I've used for electronics before, but it seems to be thinner than what's normally sold as 'Guitar hookup wire', so I'...
318 views

### What happens to a DC current at the end of a wire?

This question might be a little more appropriate for the physics stack, but I'd like to test the water here first. I am just getting into electrical engineering, and as I go along, certain aspects ...
188 views

### Is it possible to carry over 20MW? [duplicate]

Is it possible for a series of conductors carry massive currents(100 kA) at voltages over 100V? Assuming there is massive cooling. How can power plants carry MegaWatts of power?
4k views

### Why do you need a thicker wire when wire length increases?

Question: So far I've found that the thickness of the wire influences the resistance. A thicker wire has less resistance. Also, the length of a wire has a linear correlation with the resistance. 2x ...
181 views

### Capacitance of two wires with a grounded wire between

I have measured the capacitance between wires number, say, 1 and 3. With the wiree #2 just floating, the result was 390 pF. But after i have grounded the wiree #2, the capacitance was 220 pF. What is ...
3k views

### What is the white wire for on this voltmeter?

I found this voltmeter on eBay, and I know what the red and black wires are for (live and ground respectively, or alternative names), but I have no idea what the white wire is for. As its top range is ...
82 views

### Checking connection in wire bondings [closed]

I'm doing an assignment where I want create a setup to test wire connections in X-ray detector sensors. There are about 250 wires between this sensor and the control PCB. I want to test the connection ...
3k views

### What gauge wire for 36V (DC), 5A peak?

I've searched online and found wire gauge calculators but I still can't seem to find a reliable answer. What gauge wire do I need to carry 36 volts (DC) at 5 amps (peak) for 4 meters? This cable ...
153 views

### Coupling 14 AWG without Marettes

What options are available beyond marettes to join wires together? I am looking for something that holds 3-5 wires and will be within a portable box (ie will hold together if moved around a bit). Is ...
331 views

### Which AWG for an RGB LED Stripe?

I've bought a RGBLED stripe with 300 SMD5050 RGBLEDs. These are rated at ~18mA on 5V each, so I have approximately 5.4A on the complete strip. I have to cut down the strip into several parts and have ...
319 views

### Coiled wire around connector terminal, what do I call this, and how do you do it?

Please consider the following image: I randomly wandered into the telecom room at work a while ago, and I noticed these strange looking terminals. How do you terminate a wire like this? Is there a ...
2k views

### Determining maximum current through 18 gauge wire in robot arm

For a robotics application, I'd like to power some external electronics and sensors off the logic circuit in a robot arm. The components are a computer (19V, 65W => 5A), 2 cameras (1.2A), 1 light (0....
2k views

### Formula between wire size and current [closed]

Is there a mathematical formula between wire size, current, temperature and wire type(Or resistance)?
1k views

### Can I use staples to hold down electric wire?

I'm building a very small game for my brother. I am moving it from the original, ready-printed motherboard to a sheet of metal. The metal doesn't have holes punched in it, and I need a different way ...
198 views

### How significant are hysteresis losses in iron wires with RF currents?

I understand that iron isn't a great choice of conductor for RF currents, as a wire dipole antenna for example. I understand there are several reasons, but I'm wondering specifically about one: ...
2k views

### Are there rules for selecting wire gauge for single-pulse applications?

I'm trying to size wire for UL 508a panels. I have UL's wire gauge requirements, but those requirements are for continuous use. The device I'm designing will only run for two seconds, with minutes or ...
5k views

### Any tricks to attaching a wire or pin to a testpoint?

More and more often, I find myself needing to tear apart a device to seek out and connect to serial pads. These pads typically give me access to the underlying operating system for research or ...
130 views

### STM8L discovery board, wires for the breadboard

I don't know if it is the right place to ask, but still I have a STM8L discovery dev board - http://www.st.com/web/catalog/tools/FM116/SC959/SS1673/PF250636 which has very small square male-type ...
5k views

### Can I use lower gauge wire for short runs of longer high amp circuits?

This question is probably more of a "please explain whatever concept I'm missing." But I'll start with my specific question. I'm building an electric brewery and am using a 5500W 240V (23A) heating ...
186 views

### Crimp connectors making process review

I'm actually working on a project with several "little" modules. They are all connected to the PSU and the MCU. So I've design interface for each, so I can easily wire everything together. For that I'...
607 views

### Unused slots in the stepper Motor

The motor I am talking about has six wire slots of which two are unused and wires coming from the motor are restricted to four (4 to 4 jumper connecting wires are there to connect the motor ).So why ...
274 views

### Connecting phone using copper power wires

I want to install a video door phone (intercom) in my home, for this I have done a pre-wiring of 4 individual copper wires (normally used for home electricity) and the total length of wires is about ...