Horsepower is another measure of power.
There are 745.7 watts in one horsepower. Power of car engines are measure in terms of horsepower. Electronics Power is a measure of energy per unit time. Therefore the current multiplied by the voltage gives the power. A one ampere current at one volt has a power of one watt A 60 watt light bulb at 110 volts has about half an ampere of current running through it.