The unhelpful sounding physics definition: Energy is the capacity of a physical system to perform work
We know energy: light, heat, electricity, kinetic (motional) energy, potential (the energy something gets when we lift it up) energy etc.
The initial definition is actually more helpful than it might first appear
In general we are more interested in what energy transitions can do for us than the energy itself
For example electricity is a form of energy - but we are interested in what it can do for us - we can use it to generate heat, run washing machines, pumps etc.
Energy commodities that are themselves not energy contain chemical energy that may be released when we burn them:
Energy = force x distance
Energy = power x time (or power = energy per unit time)
Physicists measure energy in:
Traders measure energy (most frequently) in
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