Q:ok i have 3 questions...i have a oldsmobile cutlas supreme and i have a 0 gauge power wire that is 17 feet is that long enough???? and i have 0 gauge ground that is 17 feet is that long enough....and about the speaker wire..i have 8 gauge speaker wire that is 25 feet..is this a good setup.make sure u answer all these questions please thank you..

Power wire only has to be long enough to get from the battery to the amp with an inline fuse close to the battery. (within 18) Ground wire should be no longer than 2feet from the amp to chasis. 8 gauge is good but may be overkill for some speakers. If your speaker doesnt call for 8 gauge wire, then use a smaller gauge. If your speaker does need 8gauge wire, make sure the amp can accept this size

Q:Both wires are green but unsure if it is the top or bottom wire.

go to autozone and get a test light (looks like a screwdriver with a light in the handle and a ground) ground it and poke it on each wire, light lights up you got the hot one.

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:Is lime wire any good????

If your looking for a basic file sharing program Lime wire is a good choice. But be careful! Make sure you have a descent anti-virus program. Also some things that come up when you search for something are not what the title say they are. I found one item that is 1,050 kilobytes that has many different names on it, last I counted it had 23 different names and it is a pain to get rid of and stop. You'll find it under media just to let you know. Hope this helps.

Q:What are the types of Barbed wires?

Barbed wire is barbed wire as far as I am concerned. Otherwise google barbed wire manufacturers and see what they can supply.

Q:i want electrical symbol used in house wiring

The electrical symbol for what? Different devices and types of devices have different symbols. Also, each architectural firm uses a slightly different set of symbols so that a particular symbol on one set of plans will mean one thing, but mean something else on a different set of plans by a different firm. An UGLY's Book will give you some of the more common electrical symbols.

Q:how are lights grounded on a car? Seems like all the wires to the light have electricity running to them.

Most of the wires are for power supply. The ground is a short wire to the frame. There is a piece of wire that goes from the frame to the negative terminal completing the circuit.

Q:i am installing a headunit, i connected all the wires the match, but i have some left over that i am confused about. from the wires that plug into the radio there is the antenna wire, the remote wire, and the ground with a washer to screw it down, and from the other is set of wires is a solid orange wire, which i have no idea where it goes to. so i connected the remote to the orange wire and didn't hook up the antenna to anything, and bolted down the ground wire. I'm wondering why i have 2 ground wires, and what the orange wire is and what do i connect to it?

The orange wire may be an illumination wire that controls the illumination or brightness of the head unit's lights when the car's headlights are turned on. You have two grounds because one is a chassis ground used to ground the metal frame on your head unit to the car's ground. Your head unit may or may not have an input for the illumination wire, in which case you need to remove it. I would also ground the head unit's frame using the second ground wire. Try looking online for the pinouts for your particular car's factory head unit. This will take the guesswork out of the install.

Q:What's the factors affecting resistance of a wire? and why? thank you!

The 2nd and 3rd discussions were good but didn't discuss magnetism. The 1st guy: an open circuit has infinite resistance. Even a straight piece of wire has some self-inductance (or self-magnetism). One affect of inductance is that it opposes changes in current. So when you first apply a dc voltage across a wire and a dc current starts to flow, the self-inductance will resist the increase in current. It will appear to be because of higher resistance than expected. But the current will increase over a short time, and once it gets to a steady-state, the apparent resistance from the self-inductance is zero. This, self-inductance in a straight piece of wire, is a minor affect compared to components that presumably are in the circuit. After the current reaches steady state, the self-inductance will try to oppose a decrease in current. If the voltage and therefore the current are ac - alternating, this gets more complicated. The current is always trying to change. At the level of study I think you are, you should save this for later.

Q:When wiring my subs from a positive to negative coil, do I use positive or negative speaker wire?

Speaker wire is speaker wire. There's no difference between positive and negative wire except the markings on the jacket. If you're talking about the bridge wire when wiring a dual voice coil subwoofer in series, just use any piece of wire that's the same gauge as the wires between the other subwoofer terminals and the box terminals.