View Single Post
Old 09-14-2008, 10:07 AM   #28 (permalink)
Xringer
Old Retired R&D Dude
 
Join Date: May 2008
Location: Woburn Mass USA
Posts: 702

Little Red - '12 Toyota Prius c 2 Two
90 day: 57.82 mpg (US)

"Whitey" Bulger - '14 Toyota RAV4 LE
Thanks: 10
Thanked 18 Times in 17 Posts
Quote:
Originally Posted by jjackstone View Post
And Watts are power, whereas Watt hours are energy(power used over a period of time).
JJ
A Watt is actually a Watt-second.

A watt is a measure of actual current flow (at a certain voltage) or work done.

1 Watt=1 volt x 1 amp for 1 second of time. P=IxE

If you look at your amp meter and see 10A and your Volt meter says 12V,
during each second, you are using 120 Watts of power.

If you only left the switch on of 1/2 a second, only 60 watts was used..

If you kept the switch on for an hour, you will have used 120 watt hours.
After about 9 hours, you would have used one KWH.
__________________
Cheers,
Rich

Current ride: 2014 RAV4 LE AWD (24 MPG)

Wife's Pizza Transporter
  Reply With Quote