/diy/ - Do It Yourself

>>	Anonymous Fri May 5 01:17:44 2017 No.1172517 [View] File: 2.64 MB, 720x480, i221.webm [View same] [iqdb] [saucenao] [google] >>1172515

Anonymous Sat Aug 30 03:05:28 2014 No.689405 [View]
File: 2.64 MB, 720x480, i221.webm [View same] [iqdb] [saucenao] [google]

>>689252
Normally I don't do homework, but right now I feel sufficiently lubricated by ethanol, so...

V=IR, 250V=Resistance of motor * 50A
Rmotor= 5 Ohm
250/40=6.25
Your resistor value =1.25 Ohm
Power is 40^2 A*1.25Ohm=2000W

That seems high, but this is a textbook, and I seem drunk. Also, a large portion of the grid resistors at work are rated 40A continuous, so who am I to judge.

Pic somewhat related, it's a 30A fuse that didn't pass 200% tests. 40A rated grid resistors were used to reduce current to required amounts.

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/diy/ - Do It Yourself

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