In what units can AC motors be rated?

AC motors are typically rated in units that reflect their mechanical output and electrical input characteristics, which is why horsepower and kilowatts are the correct units. Horsepower is a unit of measurement that indicates how much work an engine or motor can perform over time, commonly used in the context of motor ratings. Kilowatts serve as another measurement for electrical power output, and converting horsepower to kilowatts is a common practice in industries to evaluate motor efficiency and performance.

Other options do not appropriately represent the ratings for AC motors. Pounds or kilograms pertain to weight, while watts or volts relate more to electrical specifications rather than direct motor performance in mechanical terms. Horsepower and amps indicate performance and electrical current, respectively, but amps alone do not quantify the output in a way that relates to the motor's operational effectiveness. Therefore, horsepower and kilowatts provide a meaningful indication of an AC motor’s capability and efficiency.