Fractional calculus approach to a single loop RL circuit

  • Nikko John Leo Socorro Lobos Physics Department, De La Salle University
  • Emmanuel Tapas Rodulfo Physics Department, De La Salle University


In a single loop RL circuit, with a DC voltage source, the current is constant. The inductor in a circuit produce a
back emf which creates a reverse current. This back-emf prevents the current in reaching the load hence, there is
no voltage across the load. This reverse current can be described by a first order time dependent differential equation
which shows the gradual increase of reverse current as the magnetic field in the inductor approaches to maximum.
But the theoretical and practical results vary by some degrees due to some systematic errors. To compensate this
error and to determine the numerical result with high precision and accuracy, the equation of reverse current is
solved in fractional differential equation form. This paper focusses on deriving the fractional representation of the
current growth and current decay in a RL Circuit. The authors used the fractional differential equation and fractional
order Laplace transform to derive the solution. Simulation of the equation with varying fractional order is included
in this paper.

How to Cite
N. J. L. Lobos and E. Rodulfo. Fractional calculus approach to a single loop RL circuit, Proceedings of the Samahang Pisika ng Pilipinas 38, SPP-2020-PB-01 (2020). URL:
Poster Session B (Complex Systems, Simulations, and Theoretical Physics)