Why does a coiled wire produce more heat when connected to the power source than a straight wire?
953505
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.
653376
New research is unlocking the amazing potential of high-temperature superconductors.  The special "talent" of superconductors is that they have zero resistance to electric current. Absolutely none. In theory, a loop of HTS wire could carry a circling current forever without even needing a power source to keep it going.\n\nIn normal conductors, such as copper wire, the atoms of the wire impede the free flow of electrons, sapping the current's energy and squandering it as heat.\n\nToday, about 6 to 7% of the electricity generated in the United States gets lost along the way to consumers, partly due to the resistance of transmission lines, according to U.S. Energy Information Agency documents. Replacing these lines with superconducting wire would boost utilities' efficiencies, and would go a long way toward curbing the nation's greenhouse gas emissions. \n\nThese links provide a wealth of information.  I hope they are helpful to you.
814978
The resistance of the filament will increase as it heats up. So you're going to get something called a "transient", which is when the initial value will stabilize (to the working current in this case), after a period of time.\nA lower starting resistance equals a higher starting current.
577456
basically all things tend to have minimum potential energy. this can be achieved when the charges stay as far away as possible from each other. \n\nhence when charges are given to a conductor the are distributed uniformly,as in the case of a symmetrical conductor, on the outer surface of the conductor to minimise potential energy. \n\nif the conductor is asymmetrical, then the charge distribution is inversely proportional to the radius of curvature.
726134
How long?  In time?  Like, seconds? \nI guess it depends on the intensity of the heat source.
1014979
The power output is smaller than the power input as most of the energy usually has been converted to heat in the process...
117733
That is a function of\n\nH = I^2 R t {a quantity of heat generated by a current applied for a time across a resistance}\n\nH=Heat in joules {1 joule = .24 calories\nI=Current in amperes\nR=resistance in ohms\nt=time in seconds\n\nIf you wanted to make the equation a rate\nJ/s=I^2•R \n\nSo what you need to know essentially is the resistance of your wire and its heat dissipating capacity\nthen you can balance the impedance with heat loss\n\nAs for a cigarette lighter in a car look at the fuse size and multiply by 12 volts to get wattage {a rate}\n\nA thinner wire will have a greater resistance\nA longer wire will have a greater resistance\nand both will lead to greater heat loss through surface area\n\nThe best thing you could do is place a rheostat and an ammeter in series with your wire and experiment\n\nAlso remember that the resistance of your element will increase slightly as it grows hot this principle is called impedance
1166116
The best example I can give of this is the PC that you used to type this question.  \n\nElectricity powers the whole thing i.e. 110 volts coming out of the wall right.  Well this 110 volts is useless to your PC.  For one thing it is alternating current (AC) and it is much to powerful, it would fry the inside of you PC.  So the first place the power goes is in to the PC’s power supply.  Here the 110 volt AC is converted into direct current (DC) and lowered to different voltages.  However when you scrub off this extra power heat is created due to resistance and that is why the power supply has a fan.  \n\nAlmost all light creates heat.  Light can only be created without heat from a chemical reaction. Reactions that produce light without heat are called chemiluminescent reactions. Perhaps the most familiar chemiluminescent reactions are those that occur in living organisms. Fireflies produce light without heat by a chemiluminescent reaction. Chemiluminescent reactions that occur in living organisms are called bioluminescent reactions. \n\nSound also creates heat because it takes power (usually given in watts) to switch the polarity (North and South poles) of the electromagnet and to run the voice coil of a speaker which have electrical resistance given in ohms.
159502
I guess that this random kinatis energy is actually heat.\n\nIf you are able too remove the heat from the backside, you could get usefull energy by using a thermopile. By doing that you take advantages of the heatflow from one side to another.
1109832
Stranded wires have slightly higher inductance than solid wires, but this is noticable only on transmission lines and larger conductors. if you are only using a short conductor, i don't think the inductance of the wire will affect the system, unless the wire is coiled.
888427
I think you are talking about a Peltier-effect thermoelectric generator, also called a thermocouple.\n\nIf you are using it as a generator and you reverse the hot and cold sides, the polarity of the output voltage is reversed. Similarly, if you are driving the Peltier module it produces heating on one side, cooling on the other. Reverse the current and you reverse the sides.\n\nThe latter effect is employed in the small 12V travel refrigerator/heaters that you can plug into a car's cigarette lighter socket. They have a switch to control whether the insulated box is heated or cooled. The switch reverses the current flow.
611192
It depends on the type of solar panel. Those that merely work in temp differential naturally preform worse. However, for those that work on radiation wavelength, the colder the temp the greater the voltage produced. The hotter the panel, the less efficient it is.\n\nNow why is this? Because both resistance and resistivity increase with temperature, thereby making the panels less efficient. This is why ultrafast and ultramodern computers are often liquid cooled.\n\nSo, provided that you can get enough of the correct wavelength of light to hit the panel (the same as in the summer) you'll actually produce a higher voltage.
87578
P = EI (Power equals voltage E times current I)\n\nMany electrical properties can be explained as analogous to water flow.  For example, a transformer "transforms" high voltage and low current into low voltage and high current, keeping the power constant (except for minor losses) at full load.\n\nThis would be equivalent to a high pressure water pump supplying low water flow to the primary winding and taking out high water flow at low pressure from the secondary winding to drive a low pressure water turbine.\n\nYou could represent the transformer core as a hollow square of wood or even thick cardboard.  On one side wrap say ten turns of thin clear plastic tube around the core to represent the primary (first) winding.  On the other side wrap say five turns of larger diameter plastic tube around the core to represent the secondary (second) winding.  Fill the primary tubing with water and red food coloring to represent "hot" high voltage and the secondary tubing with water and blue food coloring to represent "cooler" low voltage.\n\nThe explanation of course is that the high voltage primary winding will have more windings of thin tube (similar to more thinner copper wire windings) because the current will be less than in the secondary winding.\n\nThere will be less windings for the secondary coil using larger tubing because the current will be higher at low pressure.\n\nSupply the secondary tube with a shut off valve (or clip) to represent the fact that there will be no current unless the circuit is open.  In the formula, if current is zero power is also zero (on both sides of the transformer).\n\nYou can represent the pump and turbine with pictures (or drawings) of same but it would not be impossible to rig an actual pump and turbine, just not necessary to "see" what is happening.\n\nThe turbine can use up more and more power until the maximum power of the primary winding is reached but not more.  The magnet of the core will be "saturated at full power."\n\nThe rest is explaining magnetic flux in the core and how it is produced by the primary winding and cuts through the wires of the secondary to produce voltage and current if there is a load.  Each winding of a coil adds to the effect.  A transformer with equal primary and secondary windings would have the same voltage and current under load.  I believe that the phase would shift 180 degrees because of lead/lag.   Good luck.
336735
Heat can be compared to magnetism or gravity.  You need the movement or change of heat energy to generate electricity, just like you need movement or change of a magnetic field to generate electricity.\n\nYou can generate electricity from DIFFERENCES in heat energy levels (Seebeck effect)\n\n\nIf you're looking for a non-mechanical device, check out a Peltier junction.   This is an array of dissimilar metals (thermocouples) that will generate electricity as heat energy moves through it.   It is also a reciprocating device, meaning that if you put an electrical current through it, one side will get hot, and the other cool.  It is the technology used in portable electric travel coolers that you see these days.
369932
It is called grounding.  Since electricity takes the path of least resistance, a ground wire is attached to electrical equipement to divert this charge, from a short circuit as an example, directly to the ground where it will not cause damage.
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A generator produces a current by moving a wire through a magnetic field.  If you had an infinitely large magnetic field, you could move in one direction forever and produce a dc current.  However, it isn't practical to do that.\n\nInstead, you put a ball of wire inside a much smaller magnetic field and you spin it.  The ends of the wire have to be touching something to complete the circuit so electrons can flow.  At one part of the circle, the wire is moving left to right across the magnetic field and causes electrons to flow in one direction in the wire, in another part of the circle, the wire is moving from right to left and the electrons flow in the opposite direction.  This is what causes the current to alternate.\n\nSo, when converting motive energy into electricity, ac current is the easiest to produce.  This is like what is produced by a car's alternator or a hydro-electric plant.
1090570
Yes a motor becomes less efficient as heat increases the resistance in the coil to an appreciable level hence the current decreases \nresulting in less magnetic field and less effeciency\nSo a heat sink can help in increasing effficiency