Q:For my science project, need about 3 feet of copper wire...approx how much will that cost me? I want the wires to be pretty thin :)

Copper wire is probably the most expensive, but you only need 3 feet of it. Best to buy it by the foot and not by the reel. Home Depot has it. Or you can find it online (OKorder for example) as scrap wire but then you've got wait time, shipping, etc. If you know the gauge (thickness) you need, Home Depot will tell you on the phone how much it would be for 3 ft.

Q:i have an amp (sony xm 2002gtr) that says it requires 4 gauge wire..but they cost $100+ and i have plenty of 8 gauge wires. can i use two 8 gauge wires as a substitute for one 4 gauge wire?and also, i have my capacitor grounded to unpainted metal of my car AND the ground port of my amp..is that incorrect?

Two 8-gauge wires combined are equal to a 5-gauge wire, but that should be close enough for that amp. Make sure each wire has its own fuse near the battery; 40-amp fuses would be a good choice. If you capacitor is connected to ground, and your amp is grounded, then you don't really need a wire between the capacitor's ground terminal and the amp's ground terminal. It doesn't hurt anything, though. If the only ground wire at the amp is the one that runs to the capacitor, then you're better off connecting the amp ground directly to chassis metal.

Q:I recently bought a set of DT Moto emergency lights for my pickup and after installing them i found when i went to wire them to my battery the wire was too short. I didn't install the grille lights just the visor. Could i cut wires from the grille set and wire them to extend the visor light wire?

I'm looking online to find out what DT Moto lights are. Ok, I see what they are. I didn't know the brand name. LED lights in general are not high current, so they probably use lamp cord. I want to explain something to you about polarity. Electronic circuits are sensitive to the polarity of the DC electricity. The positive (+) and the negative (-) connections must be observed. So many people have absolutely no clue about this. There are just two wires. But if you extend them, you have a 50-50 chance of wiring correctly or incorrectly. There is only one allowable way. If wrong, it WON'T work, and probably will blow up the circuitry. So connection to battery or cigarette lighter plug is extremely important not to reverse the polarity. If just the LED lights got reversed, they wouldn't light, but they wouldn't be injured. Just reverse the wiring. But to the 12 volt source, polarity can't be wrong. Not for an instant. If you look closely at the insulation, you will see that one wire has smooth insulation, and one wire either has milti-ribbed insulation, or a single rib down the side. If you extend wiring, make sure to connect smooth to smooth and ribbed to ribbed. Wires should be soldered with electronic solder and the joints covered with heat shrink tubing. No crimped barrel connectors, or twisted bare wires with tape, or house wiring wire nuts. These methods all beg for failure. I don't know about robbing wire from one place and connecting to another. Is the one wire actually too long? You'll never need it? I guess you could take it. But me personally, I'd go get some wire from a lamp store. Match the wire conductor gauge (size), not the insulation size. Most lamp cord is 18 gauge. Some is 16 gauge. You can get 14 gauge or even 12 gauge. Thicker is a smaller number. Places that install car audio systems often have/sell thicker lamp cord. Have I told you enough?

Q:Two wires, 2.44 m apart, both carry current 2.2 A toward the bottom of the screen. The right wire is extremely long, and the left wire is 0.36 m long. What is the magnetic force on the left wire?

Magnetic force, F = BIL --------(1) where B is the magnetic flux density of the magnetic field caused by the right wire, acting perpendicularly to the left wire in Tesla I is the current in the left wire in Amperes L is the length of the left wire in metres To find B (due to the right wire), you have to use the formula B = (?0)(I)/(2πr) -----(2) where the I in this case is the current in the right wire, r is the distance between the two wires, and ?0 is the permeability of free space, numerically defined as ?0 = 4π×10?7 using eqn (2) so B (due to right wire) = (?0x2.2)/(2πx2.44) = 1.8x10^-7 T using eqn (1) and the value of B calculated above F = (1.8x10^-7 x 2.2 x 0.36) = 1.43x10-7 N

Q:I have a 1997 saturn sc2. In the trunk of my car there was a wire dangling down from the top when i bought it. Asked seller and he didnt know. It is not the trunk light wire or has to do with any of the tailights,blinkers,brake lights. It looks like a factory wire. It has a bunch of holes in the connector.

what color is the wire? i ask because i have a wiring diagram.

Q:What type of wire do i need to install a normal inside wall outlet? Do i have to use solid copper wire?

If the circuit breaker feeding the receptacle is 15 amps, you must use a #14 minimum size. if it is a 20 amp breaker, you must use a #12 minimum. You can use either solid or twisted. TexMav

Q:Is high quality CAT-5 ok to wire surround sound speakers to the receiver?

Noooo! Bad idea! Cat 5 is telecommunications wire, and typically designed to carry high frequency, low voltage, low power signals (i.e., network data). There are also typically four pairs of wire twisted at different numbers of turns per foot under that pretty blue jacket. These factors combine to make cat 5 a reeeally bad choice for speaker wire, and if you have big juicy amps, it might even burn your house down when it goes white-hot and sets itself on fire. If ya gotta go cheap, use 18 guage zip cord, which is insulated much better and has lots of copper strands to carry power. It usually has some marking or pattern on one side so you can keep your polarity (+ and -) straight. That's vital because your bass and your surround sound accuracy will be way bad if you get some of your speakers hooked up backwards. This may sound a bit whacked, but a good rule of thumb is to spend about 20% of the value of your gear on cables- they carry the information that eventually hits your ears as sound waves- and if any set of connections is bad, you lose quality and impact before you ever even hear it. It's tragic. If you don't believe this, go to a decent A/V store and do blind tests with good gear and different interconnects and speaker cables. It makes a difference- which is why I make my own interconnects...buts that's another question. Hope this helps.

Q:Whenever I'm making jewelry, I typically wind up using crimp beads (with toggle closures, in most cases). Whenever I cut off the beading wire at the end, after enclosing the crimp bead around it, there's always this itsy bitsy part of the wire that irritates me to no end when I wear the jewelry. It seems that I can only cut the wire so much before I wind up snipping at the crimp bead. How can I remedy the irritation fact of the left-over wire?Maybe put glue on the wire piece and let it dry? Idk. Grr.

Depending on the size of the hole in the beads, I usually run the wire down throw about 2 inches worth of beads; then crimp and clip. This also ensures that if the necklace if caught and pulled you have about 2 inches of slack before you are chasing beads on the floor. If you hole in the beads are small you can do two different things. 1) find a coordinating bead with larger holes that you can end the necklace with on both sides of the catch 2) Be sure your wire is running straight back down the original wire after going through the crimp, then crimp and clip.The end of the wire will be straighter and not tend to go out to the side and punch your neck. And unfortunately there is not a solution every time.

Q:electrical wire prices

Doh!! The reason the prices of wire follow the prices of oil, the outer jacket of Wire is Plastic an oil based product, Thus the reason oil goes up so does the prices of wire.

Q:tryin to move dryer approx 8 more feet but existing wire not long enough have 12/2 wire can that be used to run 220 dryer

Really shouldn't use no. 12 wire on an electric dryer...No. 10 is usually the mininum wire size as long as its not more than 30 or 40 Ft.