Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 3 / 3
MeasurementBlues
User Rank
Author
Re: Ampere's long arm
MeasurementBlues   4/11/2014 2:29:19 PM
NO RATINGS
@Sheepdol,

Franklin flew his kite on a Philadelphia night;
He saw that lightning was electricity.
Coulomb could tell that like charges repel
By the inverse square of their distance.
Orsted saw magnetic fields make a compass needle yield
When current passed through a nearby wire.


From my song, Electrical Heroes


Sheepdoll
User Rank
Author
Re: Ampere's long arm
Sheepdoll   4/11/2014 1:58:37 PM
NO RATINGS
I have a number of old science text books. Some dating as far back as the 18th century. Most of this relates to static electricity.  What I found interesting was how the quantities were measured.  Franklin's spark gap was used.  The length of the spark was what we call voltge.  The diameter of the spark was the current.  To measure the current a card was placed into the gap.  The spark would then burn a hole through the card.

 

MeasurementBlues
User Rank
Author
Re: Ampere's long arm
MeasurementBlues   4/11/2014 10:07:07 AM
NO RATINGS
Here's a link to NIST about the SI units.

http://physics.nist.gov/cuu/Units/units.html

 

MeasurementBlues
User Rank
Author
Ampere's long arm
MeasurementBlues   4/11/2014 10:05:47 AM
NO RATINGS
The Ampere is one of just seven basic units of measurement. Others are the kilogram, meter, Kelvin, second, Mole, Candela. But, the ampere is used to derive many other units of measurement such as the Farad, Ohm, Henry and yes, even the volt.

 

<<   <   Page 3 / 3


Radio
NEXT UPCOMING BROADCAST
Why Connect a Car?
May 11, 1pm EDT Monday
Overview: Battle-hardened veterans of the electronics industry have heard of the “connected car” so often that they assume it’s a done deal. But do we really know what it takes to get a car connected and what its future entails? Join EE Times editor Junko Yoshida as she moderates a panel of movers and shakers in the connected car business. Executives from Cisco, Siemens and NXP will share ideas, plans and hopes for connected cars and their future. After the first 30 minutes of the radio show, our listeners will have the opportunity to ask questions via live online chat.
Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...