EV efficiency can be measured in units of force, weirdly enough

[gsmith123]

(These is very much a shower thought kind of post, not a serious discussion.)

Has anyone noticed how EV efficiency is dimensionally the same as force? In North America at least typically consumption is measured in watt*hours/mile.

That's power*time/distance, or energy/distance. Energy is force*distance (1 Joule is defined as 1 Newton * 1 Meter), so we can substitute this in and get:

force*distance/distance

Cancel the distances and you're left with just force! My Model 3's consumption today was about 700N

 

[RDoc]

(These is very much a shower thought kind of post, not a serious discussion.)

Has anyone noticed how EV efficiency is dimensionally the same as force? In North America at least typically consumption is measured in watt*hours/mile.

That's power*time/distance, or energy/distance. Energy is force*distance (1 Joule is defined as 1 Newton * 1 Meter), so we can substitute this in and get:

force*distance/distance

Cancel the distances and you're left with just force! My Model 3's consumption today was about 700N

I like your observation, but efficiency isn't consumption. My interpretation would be it's the average force the drive train exerted on the car to move it. A more efficient car would require less force.

 

[gsmith123]

efficiency isn't consumption

I guess there inverse concepts (more efficient is lower consumption)

Colloquially it's pretty common to use both "efficiency" or "consumption" a shorthand for "average amount of energy the car consumed per mile driven".