物理学 7-2电源电动势 第五版 ◆电动势的定义:单位正电 R 荷绕闭合回路运动一周,非 Definition ofEMF: The work // 静电力所做的功 E done by the non-electrostatic force when the per unit positive k charge around closed circuit moving a circle W=f(Ek+) dz=f Ek dz 电动势 E, dl (EMF 第七章恒定磁场 3/6第七章 恒定磁场 物理学 第五版 7-2 电源 电动势 3/6   = +  =  l k l k W q E E l qE l      ( ) d d 电动势的定义：单位正电 荷绕闭合回路运动一周，非 静电力所做的功. i k d l W E l q  = =   电动势 (EMF) E  + + + - - - R I + Ek  Definition of EMF: The work done by the non-electrostatic force when the per unit positive charge around closed circuit moving a circle