Is it true that the more resistence the material is, the more heat it generates when electricity passes through (provided it is a conductor)?\n\nWhat factor(s) determines the amount of heat generated? Does a thin wire generates more heat than a thick wire if everything else is equal?
123552
Nichrome (Nickel Chrome) wire is one of the more common alloys used as a heating element wire.\n\nIn a way it is correct that the higher the resistance, the more heat that will be generated.  Looking at Ohm's law, V = I * R and P = I * V.   P being power, which in a resistor is exhibited as heat.  P = I^2  * R  or P = V^2 / R\n\nWhat this is saying is that while although more resistance will produce more heat, you will also need to increase the voltage (which will increase the current) to get that heat.  So, more resistance is not the simple answer, you need to match the resistance with your electrical supply capabilities to optimize the heat output.\n\nIt would probably would be better to figure that the more current flowing through the resistor, the more resulting heat you will get.\n\nAs far as wire goes, a smaller diameter wire will have a higher resistance, and will get hotter using less current.  A larger wire will have a lower resistance and require more current to get as hot as the smaller wire.  But, again referring back to Ohm's law, the overall heat exhibited will be the result of figuring the power output for the wire (voltage multiplied by current).  The larger wire will be capable of a higher power output before it surcumbs to the heat and melts because it can carry a higher current.\n\nFor the sake of comparison, let's say that we have a short piece of thin wire and a longer piece of thick wire.  Because of the difference in lengths, they will have the same resistance.  If they are both subjected to the same electrical power supply (same volts, same amps), they will both produce the SAME amount of heat.  The smaller wire will have a higher heat DENSITY because it needs to produce the same thermal energy over a smaller area.  It will appear hotter because of this.  But, if both were used to heat water, they would in theory do exactly the same thing.
291813
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.
552288
generally speaking it goes from greatest conductivity = lowest temprature to least conductivity = highest temp.  Heat increases the randomness and thereby slows conductivity.
302167
First there is a correction to your statement.\n\nResistance increases with the length of the wire or conductor; but it decreases with the area of cross section of the wire or conductor. \n\nIt will give a wrong meaning if you use the word breadth instead of area of cross section.\n\nConsider a wire of length L and area of cross section A connected in a circuit. Let n be number of charges flowing through it under a given condition.\n\nNow connect a similar wire side be side with the previous one. (This is called parallel connection)\n\nAs before in the first wire there will be n number of charges flowing through it.\n\nWhat about the second wire. Since the condition is the same as the first one, in the second wire also there will be n number of charges flowing through it. \n\nThus if the area of cross section is doubled current is increased or resistance is decreased.\n\nIn a high way there is a bridge which is very narrow; the flow of vehicles will be less.\nIf the bridge is broadened the flow will increase.\n\nHowever the above is an analogy to make the concept some what to understand. But the charge in a wire is different from the vehicle flow.  \n\n\n\n.
534800
Q:Which one creates more light - series or parallel circuits?Why?\nA: Depending on the amount of bulbs there are. If you're having one bulb in a parallel and series, the series would shine brighter (I think) because series circuit is more direct. \n\nQ:Which type of circuit - series or parallel - are used in homes? Why?\nA: Both, becuase they both have their disadvanteges and advanteges. \n\nQ: What determines the amount of resistance in a conductor (wire) and how does that affect the flow of electricity? \nA: The thinner and longer the wire, the less resistance hence the electrical current is able to flow and be conducted\n\nQ: Conductors of electricity?\nA: Usually materials of metal\n\nQ: Insulators of electricity?\nA: Usually materials of plastic and wood as well as rubber.\n\nQ:How is lightning electricity?\nA: Lightning is negatively charged and has a high voltage. Lightning is created due to friction of ice crystals and particles in clouds. \n____________________________________________\nHope this helps!!! :) :) :)
37841
it gets hot, which in turn causes more resistance, and it gets even hotter, which causes more resistance.  if there are enough amps, the metal will melt.
530823
The entire reason that every house and business and car/truck has breaker boxes is because of resistance. Current flowing where it shouldn't, and causes somehting to heat up is because of resistance!\n\nComputers....same thing. Most circuit boards have relayes that will 'trip' if a short occurs, and usually this results in things getting overheated.......because of resistance.\n\nResistance is like friction for electrons. If you rub two sticks together they get hot (resistance)....same for electrons flowing thru a wire. The electrons 'bump' into various things as they go, and it gives rise to heat to put it simply.\n\nToasters rely on resistance to work. Ever look inside when one is on? Ever see the glowing wires in there?.....resistance causes the wires to heat and get red hot! This is what 'cooks' your toast.\n\nSame for an electric oven.......electric heating in your home.\n\nDoes this help?\n\nGood luck to you!\n\n:)
483512
Thermal conductivity: \nCopper: \n9.2*10-2 (kcal/sec)/((m^2)(Cdegree/meter))\nAluminum: \n4.9*10-2 (kcal/sec)/((m^2)(Cdegree/meter))\n\nWe need to assume the rods don't loose any heat to the surroundings. Therefore the kcals conducted through both rods is equal. To calculate the heat conducted per second by the copper, multiply its conductivity, \n\n9.2*10-2 (kcal/sec)/((m^2)(Cdegree/meter)),\ntimes (A*50Cdegree/.88 m).\n\nSet that expression equal to aluminum's conductivity times A*50Cdegree/L. Simplify and solve for L.\n\nEdit: I don't know why the conductivity lines are truncated. Maybe Yahoo is making sure it is compatible with any screen resolution. Anyway, the truncated lines, that I see, should end with \n")(Cdegree/meter))".
33992
Heat energy.\n\nThere is water (or a water mixture) cooling the core directly.  This water is radioactive.  You then have coils running in the water which have other water (protected from the radiation) coursing through them.  This water gets the heat transfered to it and turns to steam.  The steam runs turbines that turn a magnet core in the center of a copper coil that in turn produces electricity.\n\nHope this answers it for ya, feel free to email me!
351522
Either directly through thermoelectric materials or indirectly by using the heat to produce motion and using that to generate electricity.
230727
Different materials conduct heat at different rates.\n\nMetal, for example, is generally an excellent conductor of heat, meaning that when you place your hand on a metal doorknob, the metal conducts heat away from your hand at a much higher rate than of you were to grab an object made of less conductive material, such as wood.  The sensation you're calling "cool" or "cold" is simply heat being conducted away from your skin.  \n\nRemember, just as darkness is nothing more than the absence of light, cold is nothing more than the absence of heat.  So when you're touching a cold object, nothing is being imparted to your skin; all you're feeling is the heating leaving.\n\nRegards,\n\nKevinb671, Ph.D.\nSertufied Science Person
646059
many materials absorb better at the infrared wavelengths than the shorter wavelengths so the absorbed energy is conserved as heat.  There are materials that absorb shorter wavelengths and convert the energy to heat, such as a microwave oven???  Water absorbs at that frequency (1-2 GHz) and the water molecule resonates.  The vibrational energy is re-emitted as heat due to a Stokes shift.\n\nThe shorter wavelengths are more energetic and more capable of depositing energy that might show up as heat but it depends on the absorption of the material itself.
186659
As we know that current also has a electric and magnetic field i.e is also electromagnetic in nature.\nWhat happens is that the electric and magnetic fields of current in a path offering resistance radiate these fields strong enough for them to propogate.\n\nkaran
56095
Electromagnetic waves??? thats something ive never heard of before. how about posting the article or the website online? \n\ni do know that electricity can be "transmitted" by magnetism, via electromagnetic induction. according to faraday's law, a changing rate of magnetic flux linkage induces an electromotive force, and thus induces current on a conductor. check out faraday's law at wikipedia for more info dude...
143822
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.
427652
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.
399023
I am a HVAC trainer in the USA, and as such I have to explain the difference between energy (heat is a form of energy) and temperature. For the most part, my students do not posses any college background, and so I do my best to explain this in layman terms. There are chapters written on this subject, and to do it justice here …. well here goes.\n\nHeat is a form of energy, as is electricity, natural & propane gas, coil, gasoline, etc. Temperature is a measurement of how densely heat energy is packed into a substance. The more heat energy there is in a substance, the more vigorous the atoms and molecules will move. If the motion is vigorous enough, the substance can change its state and assume new characteristics (ice is different from liquid water, which is different from steam). \n\nThe temperature of a given amount of substance will increase as heat energy is added to that substance, and temperature will decrease as heat energy is taken (provided the substance does not change state). If a substance is at a temperature where it will change state, examples: ice~water @ 32deg F., …. and water~steam @ 212deg F. (at one atmosphere pressure), than the addition or subtraction of heat energy will cause the substance to change state, and the temperature will not change until the substance has finished changing state  “Sensible heat” is a form of energy that causes a change in temperature, “latent heat” energy causes a change in state.\n\n”Specific heat value” is the amount of heat energy it takes to rise or lower the temperature of one pound of a substance one degree F.  For instance, if we take one pound of ice at 0deg F., and put 1/2 BTU into that pound of ice, the temperature of that pound of ice will go up one degree F, thus .5 is the specific heat value of ice. If we continue to put energy into that ice, the temperature will go up one degree F. for every 1/2 BTU of energy we put in until it reaches 32deg F., at which time the ice will be at a temperature where it will melt if additional energy is put into it. We will have to put an additional 144 BTU’s to that one pound of ice at 32deg F., to change it into liquid water at 32deg F. \n\nOnce we have liquid water, we will have to put 1 BTU into that pound of water to raise the temperature 1deg F., thus 1.00 is the specific heat value of liquid water (please note: the specific heat value of liquid water changes slightly as the water’s temperature changes, but for most calculations, the constant “1.00” can be used). \n\nWhen the water reaches 212deg F. at one atmosphere (pressure at sea level), the water will once again be at a temperature where it can change state. As heat energy is added the liquid water, it will turn into steam. The amount of heat needed to change one pound of liquid water at 212deg F. into one pound of steam at 212deg F. is ….. ready ….. here it comes ….. 970 BTU’s …. That deserves a “wow”. \n\nThe reason I made such a big deal out of the 970 BTU’s is because it’s important that HVAC technicians and mechanics understand the concept that it takes a lot more energy to change the state of a substance than it does to change the temperature one degree Fahrenheit (or for that matter, one degree Celsius).