how dose a induction furnace work?
141111
Its like a microwave for metals, only kilohertz instead of gigahertz.  Its done with a coil instead of a magnetron.
135753
A melting furnace, either arc type or refractory can be built at home, but it is quite the effort. I have melted gold (1845 degrees for 24 karat) in my driveway with a homemade refractory furnace and it took me a lot of effort and practice. Plans for this type of furnace are readily available on the internet. I have also tried aqua regia processing for gold extraction from CPUs and found the effort to be more than the value of my results.
940903
Well, the flame is a reaction with air at a certain temperature range. At the base, the heat radiates only a short distance. Above the wic, the heat travels upward (hot air raises), so the length of the flame follows this.
842595
You measure the amount of fuel put in.  Using the flow of that fuel (cubic feet per hour), you then determine the amount of energy in each cubic foot of that fuel (or look it up - Natural gas is 1020 btu/cubic foot).  Then measure the amount of heat given off and the amount of electric produced.  \n\nEnergy out (Btu's) / Energy in (Btu's) = efficiency.  \n\nYou need to convert the electric out to btu's by multiplying the kW to Btu's (multiply by 3412).  With the heat given off, you need to determine the temperature of the exhaust and the amount of air flow of that temperature and that will give you the thermal side of the output.
966618
Wow some of these answers are scary.  The air conditioner works by taking heat from inside the room and blowing it outside.  If the air conditioner is completely in the room, then all the heat that it blows outside stays in the room, therefore the temperature stays the same.\nBut...\nAll machines create heat just by running.  Think computers, light bulbs, etc.  Therefore, the temperature will get a little higher.
415304
Electricity and magnetism are closely related.  When a current goes through a wire, it creates a magnetic field around the wire.  Similarly, if a magnetic field is moved past a wire, it can induce a current.\n\nA generator spins a magnet past a series of coiled wires, inducing currents in them.  Generators and alternators both work in this way.  The difference between the two is that in a generator, the current always goes in the same direction, while in an alternator, it switches directions due to the fact that the polarity of the magnet changes as it rotates.\n\nGenerators always produce Direct Current (DC current), while alternators always produce Alternating Current (AC current).\n\nThe difference in nuclear, steam, coal, oil and hydroelectric powerplants is simply in how the rotation of the generator is produced.  The generators work in exactly the same way in each case.\n\nSolar power is different.  In the case of solar power, the current can be generated in one of several different ways.  These are more complicated, however, and I don't know the specifics of how they work.  Sorry.
1187367
It is billed based on no. of units consumed.\n1 unit = 1 kilowatt hour\nThe meter works on the principle of electro-magnetic induction.\ni.e.,the revolving fluxes set up as  a result of loading sets up an alternating flux which links with the cu ring (that rotates in in meter) and induces an emf which causes a current to flow.the current flowing in the cu ring sets up its own flux and it opposes its cause. As a result the Cu.ring rotates. The unit is recorded based on the no. of revolutions made by the cu.ring
127751
By behaviour of magnetic field associated with any electric conductor, the field is at right angle to the direction of flow of current. Means if current flows along X Axis, magnetic field's plane lies in YZ plane.\n\nVice a versa, if changing magnetic field is in YZ plane and a conductor is placed in the area of influence of field, current is induced in the conductor which flows in the direction of X axis. Well, these are basics.\n\nIn any magnetic device like transformer, motor or choke this principle is used. To strengthen the magnetic field, magnetic materials such as Iron cobalt etc are used. Electric conductors are arranged in these devices in such a way that magnetic field produced by electric current is at picked up by the magnetic material which are called as "Core". When magnetic field produced by electric current, magnetizes this core and the current causing the field is "Oscillating" the magnetic field associated with current also oscillates. The core material whether it be Iron or Cobalt, is a metal. It may not be as good a conductor of electricity as copper or silver or gold, but it is a conductor and not insulator. This oscillating field within the core produces induced current within the core itself.\n\nSince any electric current flow finds the shorted least resistance path, this induced current circuit closes in a small loop and in this process many small loops of current are formed in the core. This is similar to circulating air in a whirlpool or eddys prodcued in the water when you drop a stone in the water. Hence these current loops are called Eddy Current.\n\nThese small loops of current, circulating in small circles cause heat to be developed which heats up the core. Since there is also a magnetic field associated with these current loops, and is in opposite directiont of the main field, it results in reduced magnetic field density etc etc.\n\nHowever, in induction heating furances this unwanted phenomenon is put to use.\n\nIs my answer just that what you are looking for?
815430
"Induction heating is the process of heating a metal object by electromagnetic induction, where eddy currents are generated within the metal and resistance leads to Joule heating of the metal. An induction heater (for any process) consists of an electromagnet, through which a high-frequency AC is passed. Heat may also be generated by magnetic hysteresis losses."\n\nThis and much more info is available on the free, online encyclopedia, Wikipedia:\nhttp://en.wikipedia.org/wiki/Induction_heating\n\nHope this helps!
330815
"Each hob contains one or more coils made of ferromagnetic material. When an alternating current is passed through these coils, a magnetic field of the same frequency is produced. If a magnetic-based pan is placed on the hob, the magnetic field induces a current in the pan. The internal resistance of the pan causes heat to be dissipated, following the Joule effect. Thus it is the pan itself, and not the cooktop, that heats up and cooks the food. Once the pan is removed from the cooktop, the energy transfer stops. The result is a flame-less method of cooking in which it is nearly impossible to start a fire by forgetting to turn off the stove. Parents won't have to worry about their child touching a hot burner because the cooktop surface remains cool. Changing cooking temperatures is achieved quickly because there is no wait for the hob to heat up, only the pan. Since there is no transfer of heat energy between the hob and the pan, less heat is lost into the air, resulting in a more efficient means of cooking, not to mention a more agreeable cooking environment."\n\n\nhope that help?  we just renovated our kitchen and have installed a Miele induction cooktop and it works wonderfully.  It provides much greater control over temperature...and I am still shocked at how quickly water comes to a boil.  Who knew a stove would be so exciting? haha.
800927
dont know about q1\n\nQ2 They push the heat out at the floor because the coler air is at the bottom of the floor and since hot air rises then then the hot air will circulate more by rising through the cooler air and warming it up as opposed to being near the ceiling where the hot air would just stay near the ceiling.\n\nQ3 The smoke is usually heated and composed alot of carbon monoxide. The heated smoke will rise as it is warmer than the cooler air around it, once it cools down to the temperature around it than it will usually fall back down since carbon monoxide is heavier than air and that it will also combine with other elements in the air.\n\nQ4 A continuous hot water system works better because the the hot water is circulated throughout whatever system it is heating, such as air or other water then return back to the heater (furnace) not cooled completely and still retaining some of the heat it originally had and since it is already warm it takes less energy and time to heat it back up to its original temperature.
433870
make and working elctric circuit like a bell, r a bulb, u can Also explain working of an electromagnet using a model.\nu can also expain the capillarity concept
288352
The induction motor sets up a rotating magnetic field due to the phase lag batween the phases. This magnetic field "chases"  the rotor and tries to get it to rotate at the same speed. Ideally, if the motor is \n1. not loaded, and there are no losses due to \n2. friction, \n3. eddy currents, \n4. induction and \n5. resistance losses, \nthe rotor *will* catch up with the magnetic field and would rotate at the synchronous speed. \n\nHowever the world we live in is not ideal. All the losses mentioned above gets the rotor to always fall slightly behind the speed of the magnetic field. The difference is called Slip.\n\nNow if you load the motor, the rotor falls more behind the synchronous speed, kind of like the load is slowing it down. Larger the load, larger the slip. \n\nAnother way to look at this: If you study the speed torque characteristics of an induction motor, the torque at synchronous speed is 0. So if a rotor manages to catch up with synchronous speed, there is no more torque acting on the rotor, so it slows down again ever so slightly (due to various losses). as soon as it slows down the torque kicks in again and pushes it towards sync speed. the end result is that the rotor always is "almost at" sync speed. most motor designs have max torque at about 90% sync speed.
948920
All rotating electrical machines can be classed as either "motor" or "generator". The definition is based on the direction of electrical power flow. A motor requires electrical power to provide rotation (and hence useful torque); a generator is driven by an outside torque source to produce electrical power.\n\nFor a machine to work, there has to be a magnetic field created to transfer the mechanical power to/from the stationary portion to the rotating portion.\n\nFor the case of an induction generator, an outside force rotates the shaft of the electrical machine. (You can assume here that the rotor has been magnetized through the use of an external capacitance circuit to provide discrete magnetic poles.) The rotation of the magnetic field, through mechanical means, induces a current to flow in the stator winding. Since the winding is a resistive path, there will also be a potential developed.\n\nThe output (volts and amps) will both be sine waves, operating at a frequency dependent on the rotational speed of the rotor and the number of poles.
69358
Power induction occurs when some material that can conduct electrical current is moved through a magnetic field.\n\nThe newest type of flashlight (sometimes called "shake flashlights") uses this principle. When a shake flashlight is shaken, a magnet slides back and forth through a copper wire coil. The electricity produced as a result is then stored in a capacitor (a capacitor is an electronics component that will store electrical energy) instead of a battery.\n\nPower induction can also occur between individual lines of a high-voltage power line system.
660380
It is called induction, and happens because by moving a magnet near a conductor coil, the magnetic field changes generate a potential between the conductor tips, you may also move the coil, while the magnet is fixed.\n\nAlso if you have a coil near a magnet, and you connect the coil to a power source, the magnet will move.... so that is the way the electric motor works, because when a current flows on any conductor, it generates a magnetic field around it..
95862
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.