Q:I need this for homework :(

At 59.6 × 106 S/m copper has the second highest electrical conductivity of any element, just after silver. This high value is due to virtually all the valence electrons (one per atom) taking part in conduction. The resulting free electrons in the copper amount to a huge charge density of 13.6x109 C/m3. This high charge density is responsible for the rather slow drift velocity of currents in copper cable (drift velocity may be calculated as the ratio of current density to charge density). For instance, at a current density of 5x106 A/m2 (typically, the maximum current density present in household wiring and grid distribution) the drift velocity is just a little over ? mm/s.

Q:can i just connect a regular electrical wire on there ?

Generally a microwave has a grounded, three prong plug. I assume you are trying to connect a new plug to the severed cord. If this is the case the green or bare wire goes to the center, round prong that usually has a green screw as well. The black wire goes to the smaller blade prong that usually has a gold screw and the white wire goes to the larger blade prong that has a silver screw. Again good luck. If you are trying to attach a cord that came from another appliance, be careful that you use a cord that has as big or bigger wires than the origional cord had. Also be very sure that you get all the wires connected to their same colors. Don't use any kind of tape except electrical tape, and it might be a good idea to use a crimped solderless connector to make sure you have a good connection. Then tape all the connections separately, and then tape them all together. Sorry to hear you lost your plug so soon, may I guess that you let the cord trail and it got caught in a door?

Q:For simplification, I am adding 3 20amp new outlets (OUTLET A, OUTLET B, OUTLET C)Anything below sound wrongAll Hot(Black wires) go on brass screws (Right Side of outlet)All Neutral(White wires) go on silver screws (Left Side of outlet)Romex Hot Neutral Path.Electric Panel to top screws on Outlet ABottom screws on Outlet A to top screws on Outlet BBottom screws on Outlet B to top screws on Outlet CBottom screws on Outlet C empty.Internal OutletsI am using blue pvc single gang boxes so for the ground add ground pigtails to the ground screw on the outlet and twist pigtail, incoming and outgling ground together with green twistcap.For Exterior Outlets I am using metal boxes. Should I pigtail the ground to the ground screw on the metal box or to the ground screw on the outlet?Any problems, suggestions, etc?thanks

It will work, but you are not really supposed to wire the receptacles that way. You are supposed to pigtail with wire nuts, but everybody does it your way.

Q:Hi, My house has a wire for a light sticking out of the wall on the outside of the house. Problem is that there is no electrical box, so I have nothing to mount my light too. The outside is wood. Does anyone have any suggestions, that will work, and is safe? Thanks for your timepb4sc

Surface mount a round outdoor box to the house with screws, bringing the wire in through the back. Mount the light to the box.

Q:If you have hot wires, then electrical energy is being used to heat the wires. Is this an efficient use of electricity? Explain.Question is related to the general area of circuits, resistance, current, voltage etc.Any help would be appreciated :)

It depends on where the hot wire is. If it is in your wall, (part of the electrical wiring), it is overloaded and will likely start a fire. If it is in an appliance, such as a toaster, it is doing it's job. Someone else may shoot me down on this, but I believe that heating a grid of wires by running an electrical current through them is a fairly efficient way way to turn bread into toast. I say Fairly efficient because there is a lot of heat lost into the environment during and immediately after the toast is made and the electricity is shut off. Also, there is a period from when the power is turned on until the heating element reaches operating temperature. Also, I know of no other PRACTICAL way of making toast when the only energy comes through the electrical supply. So is it really efficient? No, but I know of no other practical way. Yes, you COULD heat up a clothes iron or similar appliance and use that to make toast, but that would be even more inefficient.

Q:Do these wires provide warmth for the birds?

All birds have natural tendency and habit of Perching (resting at a high point). For perching they need a place which is comfortable to HOLD by toes. Wires being round and of reasonable thickness and smooth provide good hold and a comfortable support place to birds.

Q:Describe how the electrical resistance of a wire changes as the wire becomes longer. How does the resistance change as the wires becomes thicker?

The resistance of a perfect resistor is R pAl where p is a resistivity constant (unchanged for a specific kind of wire), A is the cross sectional area (related to the thickness) and l is the length. If you increase l, can you see what happens to R?

Q:What is the color of the three-phase electric line?

The depth of the poles is determined by the height of the rods and the geological conditions. In general, the depth of the buried is 0.1 +

Q:How much power does the ten square power line carry? How many kilowatts?

70 cm above can be, high-voltage cables and heating pipes are mainly insulation problems, cable insulation is not the main problem

Q:Every few months between 2am - 5am we are awaken to a electrical/fire burning smell. It only last about a minute and then it starts fading. We get up trying to locate it but with it only lasting a minute we can't pin point it. We unplug everything and smell all the electrical outlets and there is nothing. What else should we try?

Considering the amount of electrical wiring that is running through a house, it is impossible to tell. In fact, it's not even a certainty that it is electrical. The fact that it happens only once every few months makes me think that it is something external - that is, that it is a smell that seeps into the house from outside (either the air or the sewage/plumbing). It could also be the result of occasional moisture causing a short in the wiring somewherebut it would be pretty difficult to discover the location unless there is evidence of moisture damage.