25 August 2012 | How Does it Work? |
A lot of people wonder how alternating current (AC) induction motors work. In fact, I myself wondered exactly how they worked for a long time.
You see, I’m an electrical engineer, so I should know these things from my university education.
Unfortunately, in this age of digital everything, power electronics tends to get the shaft in favor of microprocessor design, digital signal processing, and so on. Digital is where the bucks are, you see…
And so, for the longest time, I never actually fully understood how AC induction motors work. DC motors are easy enough to understand, but the AC versions are a bit more complicated. That Tesla was a smart dude (the man, not the car company).
Enter a series of YouTube videos that explain AC motors so well, even a monkey with half a brain could understand it!
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24 November 2011 | Gizmos, How Does it Work? |
You’ve probably heard of ARM processors a lot lately. They are used in all kinds of devices like smartphones, tablets, routers, and so on. I’m sure you’ve also heard why they are so great: They’re powerful, and they’re extremely energy efficient!
Well, so is my Intel processor in my desktop computer, frankly. On average, it uses about 9W of power (I measured), and it’s a quad-core chip!
Well, 9W is a lot for smartphones, which have very small batteries. But still, what is the deal with these mystical ARM processors? What exactly are they, and what makes them so great?
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26 October 2011 | Gizmos, How Does it Work? |
This article originally appeared in Issue #14 of The Dot Connector Magazine.
Cell phones: they’re everywhere. From the “Battlephones” of the olden days, technology has progressed inexorably to today’s Smartphone. Crikey, some people even sleep with their cell phones!
Much has been written about the health effects of the gigahertz electromagnetic radiation that emanates from your trusty phone. Whether it’s brain cancer, or interfering with sleep, or mental fog, everyone has heard of some study or another that cell phones are dangerous.
Well, let’s get real: When you hold a microwave-frequency transmitter up against your head, what do you think is going to happen?! Of course, your average cell phone emits signals at power levels that are thousands of times weaker than a microwave oven – and at a different frequency. But still, cell phone emissions are nonetheless microwave radiation, and that can’t be good for you.
To make matters worse, your super-intelligent, handheld-computer “smart phone” just loves to gobble up the juice from its battery. But what if you could minimize your exposure to cell phone radiation and increase your battery life?
If you must use the darn things, you may as well do it correctly, yes?
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8 February 2011 | How Does it Work?, Space |
This original article was first published in The Dot Connector Magazine, Issue #11.
On August 3, 2010, a C3-class solar flare caused a coronal mass ejection that headed towards the Earth. The impact of the flare resulted in a G2-class geomagnetic storm that lasted almost 12 hours. The official story is that the storm caused beautiful northern lights to appear from Europe to North America. Well, that doesn’t seem so bad, does it?
Nevertheless, there has been a lot of talk lately about solar flares and how a big enough solar flare directed towards Earth could knock out electrical grids. As we all know, sometimes the mainstream media talks up certain scenarios to scare everyone. Sometimes they just make things up entirely. In this case, I sat up and took notice because the power in southern Europe was flickering that night. Lights would dim in a pulsating fashion. That is a fairly rare occurrence. It is doubly strange because according to conventional wisdom, geomagnetic storms cause aurorae and electrical problems mostly in latitudes closer to the poles.
Obviously, some investigation was in order. First, we need to understand a little something about sunspots, solar flares, and coronal mass ejections.
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4 September 2010 | How Does it Work? |
This original article was first published in The Dot Connector Magazine, Issue #10.
When it comes to web sites and the amount of traffic they claim to have, what is the difference between unique visits, page views, and hits per day? Which measure is the most honest?
A unique visit is when one person accesses content on a particular web site in a given time period, whether we’re talking about one image or 300 different web pages.
A page view is when a person views one particular web page on a web site.
Hits, on the other hand, are when any “user agent”, such as a web browser or search engine crawler, sends a request for some kind of data to a web site. One page load may consist of multiple hits: one hit for the main HTML page, one hit for the style sheet, and multiple hits for each image on the page.
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16 May 2009 | How Does it Work? |
If you’ve ever had the pleasure of upgrading old electrical wiring in a residence, you know that a separate earth ground wire was generally not used in the past. In such cases, you find yourself with 2 wires: live, and neutral.
Now, you might want to install a grounded outlet without redoing a lot of wiring. A common method of getting around this little problem is to install the new 3-conductor outlet by tying live to one prong, neutral to the other prong, and then using a jumper wire to connect neutral to the ground connection inside the outlet.
“Theoretically, this should work just fine!” you reason.
It turns out that theoretically, you are in fact correct. Practically speaking, adding a “ground” in a 2-wire installation by tying neutral and ground together has several serious – and possibly dangerous – drawbacks.
Here’s the scoop.
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27 April 2009 | How Does it Work? |
NOTE: Being a techie and an engineer, I’m often asked questions about how things work. These types of questions are the best, because as you might imagine, engineering types are generally obsessed with how things work. So, I have created a new category on my site here entitled “How Does it Work?”
The first post in this new category is the answer to a question that a friend just asked me the other day: How does a microprocessor actually work?
Everyone nowadays is familiar with microprocessors. Everything now uses a processor of some kind: computers, MP3 players, cell phones, washing machines, food processors, and even some electric toothbrushes!
One question I get asked a lot is: how do these processors actually work? Everyone knows that there is a thing called a microchip, and that it has transistors. But how do you go from a bunch of ones and zeros to a video playing in the web browser on your cell phone? I hope to explain here in very simple terms how a microprocessor works without getting too technical – and therefore too boring!
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