I understand the frustration over terminology. As a kid trying to make sense of all this electronic goobly-goop, I too was often frustrated. In my many years of engineering, I've rarely used those terms, prefering to simpy use "voltage" and "current." Unfortunately, those terms turn up in places where they should not! Magnitute describes the measure of a quantity in a complex system, as in "magnitute and phase angle." Amplitutde is, I think, just another way of saying the same thing. But in systems where the resulting quantity is only real, then magnitute isn't an appropriate way to describe the quantity, despite being technically correct, it's use can be confusing. Sorry, I don't have a solution. Text authors should just be mindful or thier use of the terminology. But I'm happy to hear that at least someone is trying to find a way to clear the fog.