The wheel and axle is only another form of the lever.
Where is the power applied?
The power is applied to the rope which passes around the wheel.
Where is the weight?
The weight is the bucket attached to the rope which passes around the axle.
Where is the fulcrum?
The fulcrum is the frame on which the ends of the axle rest.
Is the power applied to the wheel equal to the weight to be raised?
No; the power is always less than the weight to be raised.
Upon what do the power and the weight depend?