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W
WATT
W
The watt is used to measure power or the rate of doing work.
One watt is a power of 1 joule per second.
It
is named after the Scottish engineer James Watt (1736-1819).
Watt's boulder in Glasgow. Like Archimedes before him, Watt
was struck by a world-changing idea.
More on Watt
WEIGHT
CLASSES OF TRUCKS
Trucks
are classified by their gross weight (truck/tractor, trailer
and cargo).
Class
8
The big trucks, over 33,000 lbs.
Heavy conventional tandems, cement trucks, dump trucks, etc.
Class 7
26,001 to 33,000 lbs
Fuel trucks, garbage trucks, medium conventionals, etc.
Class 6
19,501 to 26,000 lbs
Stake trucks, beverage trucks, single axle vans, etc.
Class 5
16,001-19,500
lbs
Class 4
14,001-16,000
lbs
Class 3
10,001-14,000
lbs
Class 2
6,001-10,000
lbs
Class 1
Under 6, 000 lbs
WIPER
1. A windshield wiper. We make many windshield wiper
switches, both electromechanical and electronic, for dynamic
or non-dynamic systems, with or without push-to-wash.
2. A type of contact in a switch. It is typically a springy
metal leaf that is used a) to make a solid electrical contact
(as in a disconnect switch) or b) in a rotary or variable
switch to wipe across a resistive coil to deliver a varied
output: as in our rheostatic switches.
Wiper contacts have the advantage of being self-cleaning.
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