RE: Bleed Resistor for Homemade/Large Caps - THE FULL DESIGN NOTE S

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Original poster: "Mccauley, Daniel H by way of Terry Fritz <twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>



 >>>>>>>>>Actually, this is wrong. Although the current will be identical
through a series string of resistors, the voltage
is divided up among all the resistors in the series string.  Therefore, the
power dissipated across the resistors will divide according to the
resistance ratios as well.

So, for a 10 element series resistor which needs to be 5 Watts total, each
element only needs to be 1/2 watt.

Dan




In series, the resistors current rating will be the value of the lowest
resistor in the series and the resistance values add up. In parallel, the
current rating is added, and the resistance value added. So in this case,
each resistor must be rated for 5 watts.

Regards,

Jonathan Peakall

  >
  > 143Mohm -at- 5 watts...
  >
  > Now how does one make such a resistor, since
  > I'm sure that one of that specification does
  > not exist in a single package...
  >
  > Would it be safe to series fifteen 10M resistors
  > rated for 1/2 watt each? Or would each of the
  > resistors have to be rated -at- 5 watts?