[NSRCA-discussion] JR and un-regulated 6V

[John Ferrell]

I find an analog meter more useful than a digital. Any drift while reading is obvious. Also, when you watch the meter and it looks like the voltage is going up, the resistor wattage is low, it is getting warm and changing value. 

I use a cheap Hobbico analog ESV with short, permanent leads. It lives in my radio case. I use it before every flight. I try to use it after every flight as well...

John Ferrell    W8CCW
"My Competition is not my enemy"
http://DixieNC.US

  ----- Original Message ----- 
  From: Bob Richards 
  To: NSRCA Mailing List 
  Sent: Friday, June 16, 2006 7:36 AM
  Subject: Re: [NSRCA-discussion] JR and un-regulated 6V


  Anthony,

  Resistance (ohms) = voltage / current (amps)

  6v / 0.5a = 12 ohms.

  Now, for power rating in watts:

  P = current (amps) x volts.

  0.5 x 6 = 3 watts.

  Now, the trick is to find a resistor that size. Radio Shack probably won't have one that size. But, you can put multiple resistors together to get the resistance and wattage you need.

  Radio Shack has (at least on their website) 100 ohm 1/2 watt resistors. You can parallel 8 of these to get 12.5 ohms and 4 watts. Should be close enough for your purpose.

  Bob R.




  Anthony Romano <anthonyr105 at hotmail.com> wrote:
    Good idea. Could someone suggest a resistor for 500mah load on 6v for the 
    electrically impaired?

    Anthony





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