Chapter 21 potential 第八章静电场 4 Electric potential Difference(p503电势差,电压): The av between any two points a and b equal to in magnitude work done by the fe on unit positive charge during the move from a to 6. △V=V-V=E·dl C Ed=Edi ◆△ is independent on the choice of reference potential(电势的零点无论选在何处电势差不受影响) A The value of electric potential is relative, but the one of electric potential difference is absolute.(电势的大小是相对的,电势差是绝对的)Chapter 21 potential 第八章静电场 4 Electric Potential Difference (p503电势差,电压):               b a b a a b V V V E l E l E l       d d d The V between any two points a and b equal to in magnitude work done by the on unit positive charge during the move from a to b. Fe  The value of electric potential is relative, but the one of electric potential difference is absolute. (电势的大小是相对的,电势差是绝对的) V is independent on the choice of reference potential (电势的零点无论选在何处电势差不受影响)