What classes do I need? What do I need to study?

Hey guys, so I'm just some teenager who is in first year Mathematics and Physics Bsc at University of Strathclyde in Glasgow UK.

I am doing really well since it's first year it is so easy....


I had a dream yesterday, where I designed some arbitrary piece of tech, and then after that I got the parts necessary and built it. It was a tiny gadget to measure shock waves or something.

Either way I was interested in that, and wanted to see if I would be good at it.

I don't really know what I want to do later, so I wanted to try these things out.

Now, my problem:
I have no idea how to design anything, nor do I remotely know how tech works, nor do I know anything about circuits other than basic high school stuff.

My question:
What specific classes/courses do I need to crash/take in order to get a better understanding of designing/building complex technological systems?

I am taking Physics and Mathematics currently.

 

What about designing tech for Physics uses, or tech for Biomedical uses etc...

I guess what it comes down to is an understanding of technology which is Electrical Engineering.

Any specific classes you know of? I can attend any of the classes listed here;

http://cts.strath.ac.uk/live1314sws/default.aspx?context=modules [Broken]

There are drop down menues or just type in anything.
Basically anything Strathclyde offers.