It supports watts (W), kilowatts (kW), megawatts (MW), horsepower (hp), BTU per hour, and foot-pounds per second.
Mechanical horsepower is 745.7 watts. Electrical horsepower is 746 watts. The difference is very small in practice.
1 mechanical horsepower equals approximately 745.7 watts.
A microwave uses 600-1200W. A laptop uses 45-100W. A LED bulb uses 8-15W. A kettle uses 2000-3000W.
Watts measure real power (actual work done). Volt-amperes (VA) measure apparent power. For resistive loads they are equal. For reactive loads (motors, transformers) they differ.
Multiply watts by hours of use to get watt-hours. Divide by 1000 for kilowatt-hours (kWh). Multiply by your electricity rate per kWh.
A megawatt (MW) is 1,000,000 watts. A large power plant generates hundreds to thousands of megawatts. A typical home uses about 1-2 kW on average.