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Toot

Written by Nina Kalinina on 2025-01-19 at 14:49

Science class problem:

How many amps do I need to supply to my FireWire cable so it would stop being false advertisment? The wire is 22 AWG copper, 2 meter long, and the coating is PVC (assume 250°C as the ignition temperature).

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Descendants

Written by gafu on 2025-01-19 at 14:59

@nina_kali_nina

22awg is 0,4mm^2

So it can hold around 4 amps while get only a little warm, not hot

Depends how fast you want to cook it, 10 amps will be on the low side.

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Written by Agnieszka R. Turczyńska on 2025-01-19 at 15:17

@nina_kali_nina I've found this helpful chart, which might give you some data to calculate the required value.

Obligatory warning to protect innocents: don't try it at home.

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Written by markc568 on 2025-01-19 at 15:17

@nina_kali_nina Remembering when FW was new-ish, and Apple laptops were plastic, one of the models let users insert the cable the wrong way if it was forced.

This caused actual fire!

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Written by Chris Deluca on 2025-01-19 at 16:04

@nina_kali_nina 220. 221, whatever it takes

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Written by Eli the Bearded on 2025-01-19 at 20:22

@chris @nina_kali_nina

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Written by Rob Flickenger ⚡️ on 2025-01-19 at 16:05

@nina_kali_nina If you want fire fast, I’d go for volts over amps. Much less power needed. 20-30kV at milliamps ought to overcome the dielectric strength of the insulation and start an arc burning.

Firewire can supply 30V at 1.5A. Should be plenty if you’re driving a flyback with a ZVS driver.

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Written by Kauzerei on 2025-01-20 at 08:14

@hackerfriendly @nina_kali_nina at first I was like "hey, aren't Amps and Volts somehow connected by some Ohm's law?" but your method of 30KV actually does not require the other end of the cable to be connected anywhere! It's genius, you plug one end to the source, the FireWire wire is on fire, no additional load necessary!

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Written by gafu on 2025-01-19 at 17:36

@nina_kali_nina

I forgot:

In cables over 2m lenght it is difficult to reach high currents with 5v, because the internal resistance may double up with temperatures

For instant effect glowing dark red wires may needed 😜

As always, it depends...

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Written by montar on 2025-01-20 at 08:14

@nina_kali_nina Short a car battery with it, this trick always works. I've calculated that it should generate 1 to 2 kilowatt of heat.

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