One look at electronic and electrical textbooks yields the answer. There are many different areas of electronics, involving needing mathematical knowledge about electricity/magnetism, power/heat dissipation, how circuit components behave, system response to excitation, and much more. I will provide at least one example link to give a flavor:
http://www.hobbyprojects.com/electronic_formula.html
http://www.allaboutcircuits.com/vol_5/index.html
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