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高中物理教材中,给出了一些物理量的定义式和决定式,比如加速度定义式a=Δv/Δt和决定式a=F/m、电场强度定义式E=F/q和决定式E=k(Q/r~2)(适用于真空中点电荷)、电容定义式C=Q/U和决定式C=ε_rs/4πkd(适用于平行板电容器)、电阻定义式R=U/I和决定式R=ρ(L/S).而电流强度只给出了定义式I=Q/t,没有给出其决定式,本文将介绍电流强度的决定式及其应用.
High school physics textbooks, given some of the definition and determination of physical quantities, such as the definition of acceleration a = Δv / Δt and decision-making a = F / m, the electric field strength defined by E = F / q and deterministic E = k (Q / r ~ 2) (for vacuum midpoint charge), capacitor definition C = Q / U and decision C = ε_rs / 4πkd for parallel plate capacitors. R = ρ (L / S). However, the current intensity gives only the definition of I = Q / t, and no decision formula is given. This article will introduce the determination of current intensity and its application.