An extension cord that is in use while coiled up or coiled in a reel can be a serious shock and fire hazard. The heat produced from the resistance cannot dissipate and is instead trapped between the tightly coiled cable, leading to the a fire or shock.

If you coil a wire its resistance does not change. As that is purely down to the material that the wire is made out of and the diameter, temperature coefficient and the length of the wire. Coiling the wire will however will change the inductance of the wire.

But an electrician told me; if you are using a cable, coiling (wrapping) cables is wrong. It could damage your computer, electronic devices, etc. You should un-wrap cables of devices if you want to use them.

No, there is no “bad effects”. There is a positive effect. Weak actually, but positive. Coiling a cable will increase the inductance of the all wires in the cable and this way will make it less prone to high frequency common-mode EMI.

Coiled Cables Are Increasing Mid Range Frequencies A coiled cable, when compared to a straight one, will remove much more high frequencies from your tone. It will have the effect to make you sound like you boosted your mid range on the amp.

Coil, in an electric circuit, one or more turns, usually roughly circular or cylindrical, of current-carrying wire designed to produce a magnetic field or to provide electrical resistance or inductance; in the latter case, a coil is also called a choke coil (see also inductance).

Restoring a coiled cable

1. Thoroughly clean cable.
2. Wrap cable tightly around 3/8″ wood dowel. (I used aluminum wire to hold the cable to the dowel)
3. Suspend in preheated 250F (93C) oven.
4. “Bake” for 2 hours.
5. Plunge in ice bath for 1 hour.
6. Place in freezer for 1 hour.
7. Allow to return to room temparature.
8. Remove from stick.

The most common way to quickly fix twisted headphone wires is by using your fingers.

1. Grab the wire between your thumb and index finger.
2. Keeping a mildly firm grip, slowly and thoroughly pass the wire through your fingers, moving from the base of your headphones to the end where the jack is.

If a cable has a natural coil, kink, whatever, then attempting to force it to do anything else is going to damage it. If you absolutely can’t afford a new iphone cable, then fine, straighten it out and take a blowdryer to it. Then skip coffee twice and buy yourself a new cable before this one stops working. You can’t.

How to Straighten a Curled Phone Cord

1. Work out which direction the curls in the cord go.
2. Take the phone off the hook and hold the receiver firmly.
3. Rotate the receiver clockwise or counterclockwise depending on which way each section of the cord has curled.
4. Tip.

The right way to uncoil. There is only one correct way to uncoil wire rope. One person must hold the end of the rope while a second person rolls the coil along the floor, backing away. The rope is allowed to uncoil naturally with the lay, without spiraling or twisting.

Answer: If conventional cable bend radius is less than the minimum radius, the cable insulation can’t reach standard thickness because of convex curvature of cable end excessive bending, thus affecting the insulation effect, lead to cable breakdown, or even cause a fire or other accidents.

The wire or conductor which constitutes the coil is called the winding. The hole in the center of the coil is called the core area or magnetic axis. Each loop of wire is called a turn.

four wires