Because I have studied that the resistance of a wire depends on its length, thickness and the material. Now even if the wire is coiled, the length dosen't increase, neither does the thickness and it is the same material.
2006-11-03 02:26:28 · 7 answers · asked by lubricants_99 1 in Science & Mathematics ➔ Physics
A current is simply a flow of electrons in a direction. These electrons collide with the materials in the wire, which in turn vibrate, thus producing heat. A curving wire re-directs the flow of the electrons, whose inertia resists the change in velocity (direction). The material must then act upon the electrons normal to the curve, which produces stronger collisions (greater resistivity) and thus more heat.
2006-11-03 05:33:54 · answer #1 · answered by Andy 4 · 0⤊ 2⤋
Randy is on the right track.
It's impedance (Z), not just inductance (L), that increases when coiling a wire. Impedance includes resistance (R), inductance (L), and capacitance (C). [See source.]
In general Z = R + jX; where X is a reactance that includes inductance and capacitance; R is the ever popular resistance. j is a weird thing in that j^2 = -1 and putting j in with X means that term can be an "imaginary" number...imagine that.
In a straight wire, X is very small and so Z = R for most cases (there are exceptions, coax cable for example). But when that same wire is coiled X gets bigger (one of the reasons we coil wire when making an electro magnet).
Thus, Z (straight) < Z (coiled) for the same wire and length of wire. Since energy = I^2 Z, and if we assume the current I = constant, there will be less heat created by the straight wire than the coiled one because Z (straight) < Z (coiled)
2006-11-03 06:23:08 · answer #2 · answered by oldprof 7 · 2⤊ 0⤋
Coiling Wire
2016-10-29 05:22:27 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Are you familiar with inductance? The coiled wire has a higher apparent resistance under A/C than the straight wire, because of the magnetic field producing a back flow of current in the wire.
2006-11-03 04:05:37 · answer #4 · answered by Randy G 7 · 2⤊ 0⤋
Same length with the straight wire ?
If so, I think ,the reason is the air in the coiled wire can better maintain the heat than the air around the straight wire.
2006-11-03 02:31:37 · answer #5 · answered by elle 2 · 0⤊ 0⤋
You don't say if the current is AC or DC.
With DC I think the coil and straight wire would give off same amount of heat.
With AC voltage applied less current flows through the coil due to a resistance called "inductance". Less current generates less heat.
2006-11-03 06:05:09 · answer #6 · answered by franko18042 1 · 1⤊ 1⤋
Heat is kinetic energy. The more the air/liquid has to move the more heat that is created. Because when molecules are cool they don't move as much, but when you heat something it makes the molecules move fast and create a friction that generates heat. So when air/ liquid/ etc has to move more than a straight line the kinetic energy is maintained better.
2006-11-03 02:36:46 · answer #7 · answered by Eshi 2 · 0⤊ 1⤋