Make elec tric c urre nt de fini tion, using concept of a n electrical c harg re R=rho (l)/(S) X=(omega C)^-1 I=(q)/(t) X=omega L U=IR I=(U)/(R)

electric current is the flow of electric charge. It is a fundamental concept in the field of electricity and magnetism. The definition of electric current can be derived from the concept of an electric charge.The formula for electric current is given by: where:- I is the electric current,- q is the electric charge, and- t is the time taken for the charge to flow.The unit of electric current is the ampere (A), which is defined as one coulomb of charge passing through a point in one second.The other formulas you provided are related to different concepts in electricity and magnetism: is the formula for electrical resistance, where R is the resistance, ρ is the resistivity of the material, l is the length of the conductor, and S is the cross-sectional area. and are formulas for the reactance of a circuit, where X is the reactance, ω is the angular frequency, C is the capacitance, and L is the inductance. and are Ohm's law formulas, where U is the voltage, I is the current, and R is the resistance.