eng Science and Education Publishing American Journal of Educational Research 2327-6150 2020-06-07 8 6 383 390 10.12691/education-8-6-4 EDUCATION2020864 article Hye Jung Kang Corresponding author: hkang@tamut.edu 1 Electrical Engineering, College of Business, Engineering and Technology, Texas A & M University, Texarkana, TX, 75503, USA A modern Tesla coil is an excellent multidisciplinary example in undergraduate STEM teaching. It incorporates several concepts from physics and electrical engineering. For example, Ampere¡¯s law and Faraday¡¯s law are concepts in physics while an LC circuit, an RLC circuit, and the properties of a transistor are concepts in electrical engineering. A Tesla coil shows the intimate relationship between electricity and magnetism. Ampere¡¯s law states that a current induces a magnetic field and Faraday¡¯s law states that a changing magnetic flux induces a voltage. In a classical Tesla coil, a spark gap switches the current on and off flowing through the primary coil. Meanwhile, in many modern Tesla coils, a transistor is used instead of a spark gap, since it can switch on and off very quickly using a lower voltage. Several papers described how modern tesla coils work. However, the designs of modern Tesla coils were complicated and the mathematical descriptions for Tesla coils were beyond undergraduate students¡¯ level. This paper describes a modern Tesla coil by providing mathematical details that are appropriate for undergraduate students¡¯ level. To satisfy the educational purpose of this paper, we also choose the simplest design for a modern Tesla coil. The primary circuit in a modern Tesla coil used here is a parallel RLC circuit. We show that it can play the same role as the series RLC circuit of the primary circuit in the classical Tesla coil. http://pubs.sciepub.com/education/8/6/4/education-8-6-4.pdf Tesla coil ampere¡¯s law faraday¡¯s law electromagnetic oscillator transistor