What does power excess refer to?

Power excess is defined as the difference between power available and power required. This concept is crucial in understanding an aircraft's performance, particularly in climbing or accelerating. When the power available is greater than the power required, the aircraft is able to gain altitude or speed, which indicates a positive power excess. Conversely, if the power required exceeds the power available, the aircraft may not be able to maintain its current flight path or may experience a descent. This understanding of power excess allows pilots to make informed decisions about flight maneuvers and performance optimization. The other options do not accurately capture the relationship between power available and power required, which is essential for determining the aircraft's operational capabilities.