Power Supply Voltage - Electrical Calculations Step 2 - Hot Wire Foam Cutter Tutorial

[0arenas1]

go green!

[vess25]

Thanks! A very useful link!

[LetsCutFoam]

@vess25 glad to be of service :) hit me up on the main email address ( info _at_ hotwirefoamcutterinfo com ) if you have any more questions, take care!

[vess25]

and i also tried using 2 pieces of lithium 3.7 Volt battery (CR123a Battery x 2 pieces), it can make the wire red hot (same 36 gage, same length)... that makes my confused.

[LetsCutFoam]

@vess25 check out the website, I have some information there listed specifically for batteries, so that might help you out. But long story short, the inherent internal resistance of the battery may not be allowing an adequate output amperage, which is typically the case. Generally speaking ive found it hard to get it a wire THAT hot with just a battery. cheers!

[vess25]

yes, very nice presentation, but theres something i really dont understand..

Im also calculate by the ohm's law : V = I x R

but the point is, i wanna make the wire red hot by using a small voltage battery (as low volt as i can)

Real example below:

Step 1: find out the resistance of the wire that im using:

im using 36 gage nichorme wire which should be (R = 26 ohms/Ft)

Length: 1 inch only (therefore the Resistance should be 26 over 12 = 2.167ohms)

[vess25]

@vess25

Step 2: Find out the current that i want to heat up to 2000 F:

inside your web site, in the current rating table, it said it needs 1.48amps for 36 gage wire to heat up to 2000F

so the calculation should be: 1.48 x 2.167 = 3.207 Volt of battery.

But i dont know why, i can't make the wire red hot by using a 9 volt battery, but in the calculation, voltage over resistance (9/ 2.167 = 4.15 amps ) there should be. it should be super bright red hot or even burned. but it does not happend.