Yes torque to power uses 2πNT/33,000 in old money. Did the calculation that many times, did not need to look it up. Energy when I was at school was two types, dynamic and potential, but that was 60 years ago. It can't be made or destroyed (not quite true, but OK for this discussion) but can be converted. The SI unit is the joule but there are other units kW.h, BTU, calorie, eV, erg, foot-pound etc.
More here Note the dot . means x not ÷ .
It is supplied by the Energy sector as gas, oil and electric and with electric the speed at which it is provided is measured in watts or kilo-watts.
However in the home the way to measure is normally in amps, as our volts are fixed at 230 volt or 12 volt or 48 volt etc.
So my e-bike has a 12 Ah battery at 48 volt, or 2073600 Joules, rather a big number so easier to say 576 watt.hour. Bosch mid engine e-bikes do batteries of 300, 400, and 500 watt.hour in the main 36 volt.
It does cause confusion where one is called 12 Ah and another 500 watt.hour. But the watt.hour is easier to work with, 250 watt means 2 hours at maximum output, although never will be maximum output at 16 MPH maximum speed that would be 32 miles, but in real terms looking at more like 120 miles, I have never completely exhausted my battery.
But a Wh or kWh has no time connected to it, it makes it easy to relate to how much energy will be used, but with my 576 Wh battery it does not matter if I wait 1 hour or 100 hours, unless I ride my bike it will still have same energy stored.