This questions is real world related and I\'m not sure what I\'m not undertstand

Question

This questions is real world related and I'm not sure what I'm not undertstanding. Thanks for your help in advance!

A TESLA model S 85kWh battery averages 340 Wh/ mile. It could be a little more or a litle less depending on weather conditions and use of internal systems. Is this value saying the car uses 340 watts per mile. I know a watt is a Joule per second but I dont understand how Wh and W correlate and relate to each other?

From my understanding, if your going 60 miles per hour in this car that has a 340 Wh/mile rating, 1 min equals = 0.01666 hr, so roughly 20,400 Watts per mile? Would that be correct? How would I go about doing this with other speeds?

Thanks in advance!

Explanation / Answer

We know,

1 W = 1 J/s

1 Wh = 1(J/s)(60*60*s) (since 1 hour = 60 min = 60*60 s)

= 3600 J

and
1 Wh/mile = 3600 J/mile

here it was given, 340 Wh/mile = 340*3600 J/mile

= 1224000 J/mile

so, the engine consumes 1224000 J of energy per every 1 mile distance.

Hope you understand it now.

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