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Tuesday, December 23, 2014
8:43 PM
Unknown
Measurement Conversions
|
Length
|
|
|
1 inch
|
2.540 centimeters
|
|
1 foot
|
30.48 centimeters
|
|
1 mile
|
1.609 kilometers
|
|
1 centimeter
|
0.3937 inches
|
|
1 meter
|
39.37 inches or 100 centimeters
|
|
1 kilometer
|
0.6214 miles or 1000 meters
|
|
Area
|
|
|
1 square mile
|
640 acres
|
|
1 acre
|
43.560 feet squared
|
|
1 square meter
|
10.76 feet squared
|
|
1 square foot
|
929 centimeters squared
|
|
Volume
|
|
|
1 US Gallon
|
3.785 litres
|
|
1 British Gallon
|
1.201 US gallon
|
|
1 US Quart
|
.946 litre
|
|
Speed
|
|
|
1 Mile per hour
|
1.609 Kilometer per hour
|
|
1 Kilometer per hour
|
.62 Miles per hour
|
|
Temperature Sea Level
|
|
|
32 Degrees Fahrenheit
|
0 Degrees Celsius (Freezing Point)
|
|
212 Degrees Farenheit
|
100 Degrees Celsius (Boiling
Point)
|
|
Weight
|
|
|
1 Pound
|
.453 Kilogram, 16 ounces, 453
grams
|
|
1 Ounce
|
28 grams
|
|
1 Kilogram
|
2.2 pounds
|
8:38 PM
Unknown
We all have a basic
idea about the purpose of each wire going in and out of our computer. But
a few wires seem a bit off when it comes to their appearance. They have a
cylindrical bead dangling near the end. So what’s this bead doing on that
wire and what purpose does it serve? Today, we are going to unravel this
mystery for you.
You will not only find
this bead at end of charging cables but also mouse, keyboard and other
peripheral cables. It turns out that lump’s called a ferrite
bead or, more
generically, a choke. It’s a fancy
name for what’s basically an electromagnetic wave-bouncer. If you open this
bead, you will not find any complex circuits but only a ferrite cylinder that
is magnetic in nature. It is this magnetic quality of the bead that serves the
purpose.
So basically, when
current passes through any cable, it generates
electromagnetic interference (EMI). Your electronic gadgets also produce
EMI during operation. For example, if you connect a camera to your
monitor, the camera would produce intereference and cause your monitor to
flicker without the presence of a ferrite bead. If left unabated, EMI can wreck
havoc with your computer peripherals
These ferrite chokes
ensure that signals are only sent in the intended directions and no EMI is
transmitted between the peripherals. The choke dampens these EMI waves by
acting as an EMI blocker. The blocking is most effective when it is near the
source of the EMI, thats why you will only find these ferrite beads
near the end of the cables. So, this little mystery is now solved! These
tiny cyst-like beads make sure that our computer peripherals work properly and
don’t cause any issues for the computer itself.
Monday, December 22, 2014
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