On this well handle, the length of the handle is 4x the radius of the drum around which the chain is wrapped. This means that the effort will be a quarter of the load. The density of water is 1 gram per cubic centimetre so a litre of water has a mass of 1kg and a weight of 10N. I might be able to lift 10kg so that I could pull 40kg of water up from the well.
