Ken Shirriff did an amazing teardown of an Apple iPhone Charger. If you’re like me and enjoy reading in detail about how electronics are engineered, you’ll really enjoy this one. Citations and all.
The real takeaway is that it’s a very high quality product both in terms of build quality and design. That’s pretty typical of most Apple products. Ken goes on to note that it only costs a tiny bit more yet Apple charges substantially more than the competition. However the cost analysis only covers parts, not manufacturing, R&D and patent licensing which is generally substantial, especially when you have a highly customized and well engineered solution.