Connecting several things to the same supply

A lamp lights brightly when you connect it as shown in the diagram below. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315193892/2143c097-43f6-474f-b507-c12feffdfd35/content/pg90_1.tif"/>