Tractor Talk Discussion Board |
Re: Reason for my electronics 101 question
[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]
Posted by Bob on October 26, 2006 at 07:25:38 from (69.178.229.154):
In Reply to: Reason for my electronics 101 question posted by MMB on October 26, 2006 at 06:36:24:
The field current of 3.8 Amps to 4 Amps would be at the generator's MAXIMUM output. For MAX output, the resistor is switched OUT of the field circuit by the light switch. With the resistor IN the circuit, at the generator's low output, likely the field current will be only a couple of Amps. Watts = I2 X R. 2 Amps squared = 4 X the resistance of 3.3 Ohms = a power dissipation of 13.2 Watts. Even at a field current of only 1.5 Amps, the resistor would have to dissipate nearly 7.5 Watts. Even that would likely be too much for all-day sustained operation, with the resistor in the enclosed switchbox. Better go back to the electronics supply and get a 20 or 25 Watt unit.
Replies:
Home
| Forums
Today's Featured Article -
Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
Copyright © 1997-2024 Yesterday's Tractor Co. All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Yesterday's Tractors - Antique Tractor HeadquartersWebsite Accessibility Policy |
|