Fortran was the language Electronics Engineers learned at Uni many years ago. It was something I had learned out of curiosity, and it helped me to help two friends.
Today, Python is my number one choice. It is versatile, easy to use, and quite powerful. You can simulate any situation by adding the special modules numpy, scipy, and others.
Many Python modules can be written in C, which is interpreted. They also run very fast. C code works well with Python, so C may not be a bad language to learn. Although it’s not as powerful as Python, compiled C is extremely fast.