Kilo-something = 10³×something. Symbol: k
Mega-something = 10⁶×something. Symbol: M
1kW=10³W, or 1W=10^(-3) kW
1MW=10⁶W, or 1W=10^(-6) MW
1 horsepower (HP) is *defined* as the necessary power to lift a mass of 75kg, at the height of 1m, in 1 second.
Mass: m=75kg
Weight: G=mg=75×9.81=736N
Energy: G×h=736N×1m=736J
Power: energy / 1second = 736W
This power is 1HP.
So: 1HP=736W
