A kilowatt is the equivalent of:

The correct choice states that a kilowatt is equivalent to 1.34 horsepower. This is based on the conversion between units of power. Specifically, one kilowatt equals approximately 1.34102 horsepower. This relationship is significant in various applications, particularly in understanding the power output of engines and other machinery where both kilowatts and horsepower are commonly used.

The other options do not accurately represent the equivalency of a kilowatt. The conversion factors for amperes, watts, and megacycles do not pertain to the definition of kilowatt as directly and correctly as the horsepower does. Knowing these appropriate conversions is useful in fields such as electrical and mechanical engineering, where selecting the correct power measurement is essential for system design and operation.