Write the relation of watt with kilowatt, megawatt, and horse power

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