Q:I have installed a new wiring harness on my trailer, and two new LED trailer lights. The tail lights work, both turn signals work, but for some reason, I do not have a brake light on the right side. Both lights are grounded to their own post, and I do have a good ground on the coupler of the trailer. If a turn signal and brake light in a 4 wire system are using the same wire (green in this case)- how can one work, while the other is not? Any good ideas? I really appreciate the help.

assuming it was working ok before....... funky symptoms like that (where you can't imagine the circuit that would make 'em behave like that) almost always turn out to be a weak ground -- like the ground is ok for turn signals because only one side is on at a time, but when you demand enough current to light up both sides, it just ain't happening. you can rule out a ground issue between the vehicle and trailer by hooking a jumper cable between the frames. if that don't produce a change, then run an oversized wire from the fixture direct to the connector.

Q:I have 12/3 wire running from the breaker box on a 20 amp breaker that powers a bathroom (2 lights and 2 receptacles). I want to splice into this and run 14/2 wire into the living room to run 6 recessed lights. Is this OK to do?

No, you can't extend a 20A circuit with 14 G wire. And you can't legally downgrade the existing 12 G wire circuit to a 15 A breaker. And you can't put two wires into a single breaker inside the panel. Fastest solution? Almost all brands of panel offer a two breakers in one slot or high density option. So you can get a new thing that fits in the space of one 15A breaker but has two breakers in it and two connection screws on it. Replace an existing 15A breaker with a high density 15/15 and hook up two 15A circuits. These are also available in unequal configurations - so you could get one that had a 15A and a 20A breaker in the space of a single 'normal' 15 or 20 A breaker. In some brands these high density breakers only fit in certain (closer to the mains connection) spaces - typically the top 15 or 20 breaker spaces. Slower solution. That 15 A breaker that you wanted to put two wires on? Follow the wire from it into the attic, cut it, put in a junction box and splice your new 14 G wire in there. Then again, what else is on that circuit and will 15 A supply it all?

Q:A street lamp weighs 200 N. It is supported by two wires that form an angle of 130° with each other. The tensions in the wires are equal.What is the tension in each wire supporting the street lamp?If the angle between the wires supporting the street lamp is reduced to 100°, what is the tension in each wire?

Problem 1: If the tension in the two wires are equal, the angle they make with the horizontal must also be equal. Always remember that a horizontal line is a straight angle; hence, it has a measurement of 180°. Let's look for the angle the wires make with the horizontal. 130 + x + x = 180 130 + 2x = 180 2x = 180 - 130 2x = 50 (Divide both sides by 2) x = 25° Each wire makes a 25° angle with the horizontal. We can now find the tension. The mass must be divided by 2. Using trigonometry, let's find the tension force. The divided weight of the lamp shall be the opposite side, and the tension force shall be the hypotenuse. sin 25° = (200 / 2) / Ftens Ftens = 100 / sin 25° Ftens = 236.62 N (Answer) The tension is 236.62 N in each wire. Problem 2: We use the same approach. 100 + x + x = 180 100 + 2x = 180 2x = 180 - 100 2x = 80 (Divide both sides by 2) x = 40° Each wire makes a 40° angle with the horizontal. Calculate the tension force. sin 40° = (200 / 2) / Ftens Ftens = 100 / sin 40° Ftens = 155.57 N (Answer) The tension is 155.57 N in each wire. Hope this helps!

Q:Suppose we have a 10v battery.one end of the battery is at 10V electric potential and other is at 0V Hence,the potential difference is 10V.if we measure the voltage( p.d.) across positive terminal at 10V and the middle of the wire connecting both ends of battery will it be less??I mean,at the middle of the wire the electric will not be zero,right??(correct me if am wrong)Thanks!!

If the wire had some reasonable resistance which prevented melting of the wire and explosion of the battery; the middle of the wire would show half the potential difference between the terminals. The wire connecting the terminals becomes a potentiometer with Voltage falling linearly between the terminals (assuming uniform resistance along the length of the wire). In practice, Voltage drop on a wire supplying power to a load is proportional to the resistance of the wire divided by the resistance of the load. When the wire is the load, all Voltage drop occurs along the wire.

Q:has black wires.

Two black wires in the box would be a hot from the supply and a switched hot to the load. If the timer has only two wires then it should be pretty easy to just connect them. If they are marked line and load then you would have to hook the wire for line to the wire in the box that is always hot from the supply and the other to the wire marked load. If you are still unsure then it really is not a job for you alone, enlist the help of someone with a bit more experience or even an electrician.

Q:I bought a bathroom vent fan today, the one that was in there hasnt worked since we bought the house. Anyways, i have a black wire, and a white wire coming from the light switch on the wall ran up to the ceiling where the fan is, and a black, white, and GREEN comin off the new fan i bought. Do i need to get in the attic and run a ground wire from outlet to fan? Or are the black and white good enough? The old fan didnt have a ground wire, just the other 2. Any info is greatly appreciated. Thanks

Green wire should be screwed into the inside of the receptacle box or pigtailed to the bare copper wire in the back of the box. If neither a bare wire or a green screw is present, call an electrician to run proper wiring to the box

Q:Can I use 12-2 gauge wire on a 10 amp breaker to wire my light switches,and can I use 10 gauge wire on a 10 amp breaker? For a light fixture

Normally lighting circuits have a 15 amp breaker for protection and wired with 14 gauge wire. 14 gauge wire is good for 15 amps. 12 gauge wire is good for 20 amps. 10 gauge wire is good for 30 amps. So you can use 12 gauge wire, if you alrady have it available, but if you are going to go out and buy it, you can save some money by buing #14 wire. You can always go oversize with the WIRE just never undersized with the wire. Circuit breakerprotection is prescribed by the NEC. 15 amps for lighting and 20 amps for wall outlet power. I don't know where you even found a 10 amp breaker. ---------------------------------------... WOW! XTX has no clue what the National Electrical Code even says about this! Disregard his answer! It will get you into trouble!

Q:I'm trying to wire a Sony L410X stereo to my 2002 Chevy Silverado 1500. I don't want to use a wiring harness, so I'm trying to figure out how to splice the wires together. I don't know how to hook the power wires up correctly. Obviously hooking the speakers up will be easy. I've tried looking at the wiring diagram but it seems like on the stereo system diagram it's positive and negative whereas the truck wiring is not identifying the negative wiring, just 12v+ Constant and 12v+ Switching. Any guidance would be greatly appreciated!

get okorder /

Q:When was the hot-wire anemometer invented? and who was it?

Sir Charles Wheatstone in 1843 modern anemometer use ultrasound hot wire sensors are used as mass air flow but did not find original usage! Guru

Q:But I want to switch it and wire the red ceiling wire to the black fan wire and the black ceiling wire to the black/white fan wire so that the particular switches work the way I want them to. Is this ok, to switch them?

Black wire on the fan is for the fan motor, red wire in the fan is for the light, the white wire is the neutral wire. So if you do want to switch the light off and on you have to tie red wire to the switch and the black wire can be tied to the hot at the ceiling box so you can control the fan with the chain only. If you have one switch leg in your circuit then you cannot do anything but switch them both if you tie them together. I think I am understanding what you are saying here. White Alyse ties to white Black is for the fan motor and the red is for the light. If you have three wires in the switch then you can tie them the same way color to color. Hope this has not confused you You can email me if you need further help