Heating a wire with electricity

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Rob

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Joined: Nov 01, 2019

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Heating a wire with electricity
November 1, 2019 - 3:21am

Hi all.  Just trying to teach myself about electricity so I can teach my kids later.  Hope this is the right place to post this.

i want to make a small device to seal bags.  Plastic to begin, but Mylar bags once I get it working. 

So I ran a 9 volt battery to a screw with appropriate gauged wire.  I then ran from the screw  to another screw with very thin wire. Finally thick wire back to the battery.

My problem is the thin wire is not heating up At all.

the battery quickly becomes warm, so I think there are no short circuits.

not only is the wire not heating up, but I licked it and didn’t get a shock. (I blew my multimeter a while ago and haven’t gotten another one yet)

Any suggestions what is going on?

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Stop doing what you are doing
November 3, 2019 - 5:01pm

Just trying to teach myself about electricity so I can teach my kids later

There are so many other concepts in electronics, don't start by teaching them how to heat things with electricity on the first step. 

the battery quickly becomes warm, so I think there are no short circuits

Batteries  should never become warm, if it is getting warm it means there is a short circuit and you are draining more current out of it than you are supposed to 

not only is the wire not heating up, but I licked it and didn’t get a shock. (I blew my multimeter a while ago and haven’t gotten another one yet)

Please get another multimer, licking your battery terminals is defiantly not the way to check if a battery is still powered. And please don't do it in front of your kids.

 

That all said if you want to still heat a wire try nichrome wire and make sure you have some kind of circuit to limit the current flowing through it. Never ever short two terminals of a battery directly with any kind of wire. Also, heating wire can only help you in cutting the plastic I doubt if it will help in sealing plastic bags 

 

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Joined: Nov 07, 2019

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Joule heating, also known as
November 13, 2019 - 2:28pm

Joule heating, also known as Ohmic heating and resistive heating, is the process by which the passage of an electric current through a conductor produces heat.