Do Electrons Move or Charges Move?
-- I am teaching 4th graders. Everything in their materials show electricity flowing out the negative terminal of D-cells, through components such as wires, bulbs, motors and back into the positive terminal. My school district, formerly provided us with an answer key showing a similar circuit but had electricity flowing in the opposite direction. I just watched...Read More
Basic Electronics - DC Electron Flow
-- For electrons to flow, they have to go around in a circle -complete circuit-. The electrons have to be traveling from the power source -in this case a battery-, through a wire, through a load, through another resistor, and finally back into the power source...Read More
What are Pull-Up or Pull-Down Resistors?
-- Pull-up or Pull-down resistors are resistors whose job it is to pull and Integrated Circuit's (IC) input voltage either up to the power supply voltage, or down to circuit ground. The IC's input is usually high resistance; high enough that the moderate resistance on the Pull-up or Pull-down resistor acts like a short to the power supply (Pull-up resistor) or a short to circuit ground (Pull-down resistor)...Read More
What's the Purpose of the Zener Diodes?
-- The circuit is just about the same as a Conventional Class B fire alarm circuit. The "control box" it's connected to looks like it has explosion detection devices also connected to it, and when explosion is detected, the control box closes a valve for people safety as well as property safety and protection...Read More
How Does a Relay Work?
-- They're electrical switches; like a light switch on the wall, a relay turns on or off the electricity. The difference between a light switch on the...Read More
Is Conduit Ground Good Enough for Electronics?
-- The National Electrical Code (NEC) is concerned with fire safety and with electrical safety. The electronic technician is concerned with those issues, but the electronic technician is also concerned with signal transmission ...Read More
How Does One Connect RS232?
-- So two pieces of equipment can send data to each other, RS232 carries the data. When connecting the equipment using RS232, there's guessing the RS232 is wired correctly, and then there's knowing ... Read More
What is an Arc Flash?
-- Burning, blinded, deafened, an electrician is thrown across the room; having reached into a live electrical panel, all he did was to drop... Read More
What Does E=IR Really Mean?
-- If it isn't just a word, and it isn't really something to be memorized in order to pass a test, what do the letters in Ohm's Law really mean?... Read More
What is a Flyback Diode?
-- Someone Thinks the Flyback Diode is Important. Manufacturers all over the world spend good money installing these diodes, they must think they're ... Read More
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