Enroll in undergraduate physics at a community college, or as an unmatriculated student at a university. The electricity and magnetism theory as taught to physicists is in many ways better than that taught to engineers.
Alternatively - and less expensive - read The Feynman Lectures on Physics by Feynman, Leighton and Sands, followed by the first part of Jackson's Electrodynamics.
University of California Santa Cruz' Physics Department has two good courses that teach how to design and build the electronics for use as experimental apparatus. The first quarter is analog, the second digital. After I took both courses, I did well at a summer job where I repaired electronic gear for the department.
Alternatively - and less expensive - read The Feynman Lectures on Physics by Feynman, Leighton and Sands, followed by the first part of Jackson's Electrodynamics.
University of California Santa Cruz' Physics Department has two good courses that teach how to design and build the electronics for use as experimental apparatus. The first quarter is analog, the second digital. After I took both courses, I did well at a summer job where I repaired electronic gear for the department.