Q:A wire has a resistance of 21.0 ohms. It is melted down, and from the same volume of metal a new wire is made that is three times longer than the original wire. What is the resistance of the new wire?

The resistance of the new wire is (in terms of its length, area resistivity); R2 = pL2/A2 And the resistance of the original wire is; R1 = pL1/A1 The ratio is;(resistivity will cancel because its the same for both situations) R2/R1 = L2A1/L1A2 given L2 = 3L1 R2/R1 = 3A1/A2 To find the new cross-sectional area ,require the volumes to be equal; L2A2 = L1A1 3L1A2 = L1A1 A2 = (1/3)A1 Sub this into the R2/R1 equation to get; R2/R1 = 9 R2 = 9R1 = (9)(21) = 189 ohms

Q:Need wiring diagram for ford F250 2004 disel

hit okorder

Q:A load of 125 kip is being held by 3 wires all going up. The Wire one goes straight from the load to the horizontal. Wire 2 and 3 form a V on top of wire 1 and are 30 degrees from wire 1. This is a 2-D problem.

You need to use summation of forces. Wires 1 and 2 are gonna have the same tension on them, just in opposite directions. so in the x direction, Fx=125cos(30)+125cos(150) (the vertical wire doesn't contribute to the x-direction forces and I choose 150 because the wire on the left really has an angle of 180-30 or 150) in the y direction, Fy=125sin(30)+125sin(150)+125sin(90) (The vertical wire is a 90 degree angle) Tension=sqrt( Fx^2 + Fy^2 )

Q:I already tried wire cutters, and they just bend it!

Get a new pair of wire cutters. That's what wire cutters do... Cut wire.

Q:Wire runs from breakers to a wall outlet along the garage wall

Ok so the first two answers are almost correct. If the breaker is 20amp it's 12 gauge wire, if it's 15 amps it will be 14 gauge wire. The outlet is in a garage it must be a GFCI receptacle. That's a national electrical code requirement. If the wiring is to be exposed (ie not inside of a wall) then it must be in conduit, cheapest and easiest to install is pvc, you can run romex or NMB through conduit. If the wall is to be sheetrock when finished then you can run just romex through the studs. It is recommended that the GFCI receptacle be mounted in an extra deep box but is not required, makes it easier to get it in there with the wires. You can put up to 8 receptacles or devices, like light fixtures on one 20 amp circuit. More and you will be over loading the circuit. The romex you run should be for 20 amp 12-2 with ground. All circuits and devices must be grounded to be in compliance.

Q:A wire has resistance 56.8 ohms. If another wire consists of the same material but has twice the length and half the diameter of the first, what is the resistance of the 2nd wire?

Resistance = rho * L/A where rho = resistivity of the material, so it's the same for both wires. You've doubled the length, and you've divided the area by a factor of 2^2 = 4. Calculate rho * (2L)/(0.25A) and compare that to rho * L/A.

Q:How do you attach light wires to boat trailer frame?

The colour code for trailers is as follows, white-ground, brown-running, yellow-left turn, green-right turn and blue would be for trailer brakes if your trailer has them or auxiliary. If your adapter (on the Dakota) is hooked up properly those are the wire colours that run from your vehicle into the trailer lights and the signal lights will also be the brake lights.

Q:I made a kill switch for my car. All I need to do now is cut the wire that goes into my engine control module and join it with the switch I made. Would it be fine if I just use wire nuts or some sort of tape to join the wires instead of soldering? The instructions say quot;Step 6: Attach the killswitch wires one to each side of the wire you just cut. Step 7: Tape up all new connection.quot;It says to tape the new connections, but should I use exactly?

Sure thing. Wire nuts work fine. I've used them a bunch on my project cars. However, if you want a connection that won't be affected by water (rain and/or humidity) and a connection that is permanent (won't come loose) use automotive crimp type connectors covered with heat shrink tubing or liquid electrical tape.

Q:Electron flow in a conducting wire.?I have some confusion regarding the flow of electrons in a wire when voltage is applied across it. Intuitively, i see that when i apply voltage across the ends of the wire say by a battery. The voltage pushes the electrons in the wire. As, a result the electrons flow in straight direction rather than going zig-zag. Some of the electrons reach the positive terminal of the battery, now my query is what happens when the electrons reach the positive terminal.Do they loose all their energy? Also, how is there a constant flow of electrons in the wire because since electrons are flowing constantly from the negative to the positive, is there no instance all the free electrons in the wire have reached the positive terminal? Basically what i mean to say is do the free electrons ever gets extinct? I am sorry if my question sounds stupid but can anyone please explain me a little bit in a conceptual manner?

Well, the wire is connected to a voltage source. When they leave the positive terminal, they go through the wire, then get to the negative terminal. They then flow through the voltage source and back into the wire.

Q:my questions is what wires go where. i just bought a Hunter thermostat model # 44155c. on my old thermostat the wires are as followes:W2-jumps to quot;F(Yellow Wire)F-Yellow WireO/B-Light Green WireR-Red WireG-Dark GreenC-Red Wire Y-Yellow WireMy new thermostat has these options:RH, RC, G, Y/O, W/B, Y1can anyone tell me what wires go where?thank you

you were suppost to mark the wires by which they were screw to by color code; w rd blk etc.and then wire to new unit with same color code, some terminals need a small branch wire to bypass, lets say an ac with a heat pump.Ok now this is what an ac man will do, he will go to the compressor and write where the wires there are wired and then he would look up the color code and put the wires where they go. Also i relie heavily on the 800 help line number.Some ac men will put different colors on the wrong terminals, put a sticker on the unit and when there is trouble, they will call him,if all the wires were black and he knowes where they go, you see. A trusted ac man would be a great help,and remember, you're checking at the wall, not at the unit where the signals are not being recieved correctly, the thermostat is the brain, and one more thing, you are on the right track, because a progamable thermostat can save you a lot of money especiall if you're gone a lot.