1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
January 1969 Popular ElectronicsTable of Contents
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. All copyrights are hereby acknowledged. See all articles from Popular Electronics.
By Robert P. Balin
The brightness of a lamp operated on a.c. depends on the average current through its filaments during each cycle. A rectifier connected in series or parallel with the lamp can be used to control the current on alternate half cycles. In lamp circuits, current paths and individual lamp brightness may be considerably altered, and some interesting effects produced. To test your ability to analyze lamp and rectifier circuits, try to determine which lamp is the brightest in each of the ten circuits shown here. Assume that the diodes have zero forward resistance and infinite back resistance and that all lamps and supplies are identical.
|Here are other Popular Electronics quizzes:|
- Lamp Brightness Quiz, January
Posted September 17, 2012