Author(s)

Tsao Chang

Shanghai Science and Technology Senior University, Shanghai, China.

The model of lumped element circuit ignores the finite time of signals to propagate around a circuit. However, using modern oscilloscope, the time of nanoseconds in a circuit can be measured. Then the speed of alternating electricity can be obtained in a RL circuit. A typical RL circuit is formed by a power source, wire, resistance and inductance. The basic formula is: U(t)=I(t)R+LdI(t)/dt. It can be derived from the Ohm’s law and Kirchhoff laws. Based on our experimental results, this paper has discussed the new explanation of this equation in a RL circuit. As a result, the speed of alternating electricity is greater than light in a special RL circuit. The model of lumped element circuit can be improved when considering the finite time of signals.

Lumped Element Circuit Model, RL Circuit, Finite Time, Speed of Alternating Electricity

Chang, T. (2018) An Experiment to Improve the Model of Lumped Element Circuit. Journal of Modern Physics, 9, 596-606. doi: 10.4236/jmp.2018.94041.