Introduction：
Power Unit Converter: Supports online conversion between Watt(W), Kilowatt(kW), Imperial Horsepower(HP), Metric Horsepower(PS), Kilogram‑meter/sec(kg·m/s), Kilocalorie/sec(kcal/s), BTU/second(Btu/s), Foot‑pound/sec(ft·lb/s), Joule/second(J/s), Newton‑meter/sec(N·m/s).