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 -
The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
... [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 |
|