Latest threads in ⏚ Electrical Engineeringshow only best voted threads
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is roommate right about the cost of turning heat (gas) on briefly in the morning?
This morning it was a little cold, so I turned the heat on while I was in the shower. This uses natural gas. Our house is not large, maybe 1200 sq feet or so. Is it true that in terms of actually...
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16 years ago
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dot matrix lcd tutorial
Hi, Does anyone know where I can find a tutorial on how to program one of those dot matrix lcd displays? I'm not talking about those 2 or 4 line displays where write in the letters, I'm refering to...
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16 years ago
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Bonding advice
Hello to all and thanks for any help you can provide me. Some time back I looked into installing a wifi antenna on the outside of my brick office building here in town. I would offer free wifi to the...
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16 years ago
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Relay Symbol ?
Hi, Have a forced hot water system for home heating that uses the typical 2 wire Honeywell thermostat to control a Honeywell RA832A switching relay. The switching relay closes the circuit to the...
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16 years ago
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POWER FACTOR
On a balanced 3 phase given kw and V: To find Current: (kW x 1000) / (E x PF) = amps I have a 208v, 50/60Hz, 9kW, 3 PH kw=9 E=208 PF=??? I know PF = cos(theta) or PF (3 PH) = Input Watts / (E x I x...
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16 years ago
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Electrical Problems
Can I ask about a residential electrical problem on this group ? Thanks..Howie
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16 years ago
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Broken Flat Screen Monitor
I have a 15" Envision flat screen monitor that has a picture for about 10- seconds during initial powering then dims to almost nothing afterwards. I'm unfamilar with how flat screens work and not sure...
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16 years ago
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Putting commercial quote in perspective
Doing some electrical work in a commercial building and have been told to use the buildings approved electrical contractor. The quote he gave me seems outrageous, and I wanted to see what people...
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16 years ago
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Holy Moly -- Residual Electricity????
| They discharge, but it can take some time depending on the capacitors. | A few minutes is not at all unusual. Yes, indeedy. I have a Heathkit AR-1500 (amp receiver) that, when powered off playing...
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16 years ago
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Ancient adVertising (big free collection)
Hi. We are mounting a web of ancient advertising (from the XIX century to the 80´s) and there is a a lost ofposters and badges that could interest you. Tehere is ads about ebery subject (cars,...
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16 years ago
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Dimensions in equations
I'm reading from an electrical engineering book that some voltage v(t) is given by: v(t) = sin(1000*t) where t is the time Isn't this expression, strictly speaking, incorrect? How can we find the sine...
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16 years ago
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Slip ring induction motor fault
What would the current curve of the stator of a slip ring induction motor look like if the resistive load of the rotor suddenly rose towards infinity? I imagine it would behave like the primary...
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16 years ago
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How to disable charger circuit on APC UPS
Hello, I have this question posted in another group as well but I figured I'd give you folks a shot at it. I have two APC rackmount ups units. One is a 2200XL model which has a larger internal charger...
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16 years ago
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Direct current distribution
Are there any regions of New York City or elsewhere where power transmission is mostly by direct current at approximately 110/220 volts? Bill
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16 years ago
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lightening arresters in airplanes
Can some one tell about the lightening arresters in airplanes. Thanks ams
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16 years ago
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