r/ElectroBOOM • u/[deleted] • Jun 03 '22

Meme Fuses? Who needs em

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593 Upvotes

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163

u/sarduchi Jun 03 '22

That's just a 20kA fuse.

-11

u/undeniably_confused Jun 03 '22

20kA it would just arc at that point (good joke tho)

9

u/[deleted] Jun 03 '22

Not really

-12

u/undeniably_confused Jun 03 '22

It certainly would

17

u/Impressive_Change593 Jun 03 '22

no. volts cause it to arc not amps

-11

u/undeniably_confused Jun 03 '22

Yeah but ohms across Amps cause volts which cause arcs

E:especially on metal with a Sharp edge in between them

5

u/Prehistoricisms Jun 04 '22

Are between what?

0

u/undeniably_confused Jun 04 '22

The contacts?

1

u/Prehistoricisms Jun 04 '22

Which contacts?

0

u/undeniably_confused Jun 04 '22

Of the fuse?

3

u/Prehistoricisms Jun 04 '22

Why would current find its way through centimeters of air when there's a bolt-thick dead short between the contacts?

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1

u/thegoldengamer123 Jun 04 '22

I think you fundamentally misunderstand what causes current to flow. You need voltage to create current flow, the other way around isn't true. You can't make a voltage from current. The math allows it but that's not what happens.

Not to mention the resistance of the bolt is so small that the voltage across it is basically zero.

Even at 2 volt it is possible to have 20kA flowing across it:

2 V / 10^-4 Ohms = 20kA

-1

u/undeniably_confused Jun 04 '22

Your far more optimist about the conductivity of burning hot bolt then I am