Mind boggling heater coil question?

Question

Connection wires to a electric heater doesn't get hot, when the heater coil is hot. why?

Lets think about a nicrome coil (of course small in length) connected to a lead acid battery via an uninsulated copper wire (of the same diameter as the nicrome coil)

Condition 1: Battery is switched off :- Now the nicrome wire is heated by a candle flame, as a result the coil heats up, and the connection wire (i.e. copper wire) also gets heated up in this case.

Condition 2: Now the battery is turned on and the coil gets heated ( in fact red hot), but this time the copper wire does not get much heated.Why?
I hope this has to do something with the flow of electrons

Answer 1

Actually, in either case, the copper wire is heated by conduction of heat from the nichrome coil. If you substitute a torch for the candle, one that can heat the coil red hot, the copper wire will heat up just about as fast as it would because of electricity.

It's the temperature difference between the (hot) coil and the (cooler) copper that causes heat to flow from the nichrome. Heat flows from a hot place (molecules more agitated) to a cooler place (energy transfer by molecular collisions).

Exposed to a current, nichrome (condition 2) heats up much more than the copper because it has a high resistance to the flow of electricity, whereas copper has a comparitively low resistance. The same current, obviously, is flowing through both.

However, copper is a relatively good conductor of heat, so some of the heat from the nichrome will flow into the (cooler) copper wire connected to it. That heat will flow along the copper wire and be radiated from its plastic insulation coating. (In some old heaters you'll see a mineral material covering the wire near the coil, where heat would burn the insulation off.)

The coil gets hot until it radiates its heat energy as fast as it is generated, then no hotter.

Answer 2

How much do you know about nicrome?
Nicrome is a resistance wire. Suffice to say, current passing through it will cause it to heat up. Copper has much lower resistance. Current passing through it will cause it to heat up, but to a far less degree. Since current flow is the movement of electrons, your wish is granted. The flow of lectrons through the Nicrome wire causes it to heat up.

Answer 3

IF YOU HAVE 2 PISCES OF WIRE, ONE LARGER DIAMETER THAN THE OTHER THE THINNER ONE WILL HEAT UP IT BECAUSE IT CANT CARRY THE ELECTRICAL LOAD , IF TOO MUCH LOAD IT WILL BURN IN TWO,THAT'S HOW A FUSE WORKS. ITS SMALLER THAN THE CIRCUIT ITS PROTECTING AND MADE TO HEAT UP AND BURN IN TWO IF THE LOAD TO TOO MUCH FOR THE CIRCUIT FOR TOO LONG,AS FOR HEATING UP WITH A CANDLE, THAT'S CALLED HEAT TRANSFER , WORKS GREAT WITH ALUMINUM, BRASS AND COPPER, LIKE ON BOTTOM OF POTS & PANS

Answer 4

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