• 0 Posts
  • 43 Comments
Joined 2 years ago
cake
Cake day: June 19th, 2023

help-circle





  • my 50 watt lightbulb will run for an absurd number of years when hooked up to a nuclear generator and will be completely vaporized by the nuclear bomb.

    That is true whether you express the energy as kWh or MJ.

    Also keep in mind your average person likely doesn’t remember their physics classes and how joules, time, and watts all relate to each other

    It’s becoming clear to me that you don’t either. KW is not the same as kWh, the latter does not have a time component anymore despite the name. Watt is the amount of joules per second. kWh is the amount of energy spend it you use 1KW for an hour regardless of the time that amount of energy is spend in similar to how a lightyear is the distance that light travels in a year regardless of how long you take to travel that far.


  • Uranium has 2x10¹³ joules of energy stored. You can use all that energy at once in a bomb and explode a city in a second, a lot of Work done very quickly, ooooor you could put it into a reactor and power a city and do a lot of Work during a much longer time period.

    And the amount of kWh provided is the same in either case. So using kWh gives you no relevant information about how the device uses that energy during a period of time.