At a given weight, and without increasing power, what will occur if the angle of attack increases?

When the angle of attack (AoA) increases at a constant weight without an increase in power, drag will indeed increase. This is due to the fact that as you increase the angle of attack, the aircraft's wing generates more lift initially, but it also increases the induced drag. The aerodynamic stall angle of attack is the critical point where lift begins to decrease rapidly; prior to reaching this point, although you are generating additional lift, the airflow over the wing becomes more turbulent, resulting in a rise in drag.

Conversely, while an increase in angle of attack can lead to greater lift, it does not serve to directly decrease stall speed. Stall speed is the minimum speed at which an aircraft can maintain level flight and it is influenced by the weight of the aircraft and the wing's characteristics, rather than solely by the angle of attack.

Furthermore, an increase in angle of attack at constant weight will not inherently lead to an increase in speed. In fact, as drag increases, the aircraft may reduce its speed unless additional power is applied. The correct understanding of these relationships between angle of attack, lift, drag, and stall speed is crucial for pilot performance and safety.