[Amps] 8877 filament

[Bill Turner]

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On Fri, 5 May 2017 09:38:02 -0700, VE7RF wrote:

>
>##  8877 is 5 V  at 10.5 Amps.   That’s a hot resistance of  .476 ohms. 
>At just 3 volts, the current draw would likely be aprx  6.3 Amps =  18.9 watts
>And even less, if  2.5 V was used.

REPLY:

Heater resistance is not linear with temperature. You can not
calculate accurately using Ohm's law, it has to be measured. 

73, Bill W6WRT