Chapter 21 potential 第八章静电场 New words and Expressions electric potential 电势 potential difference 电势差,电压 circulation theorem 环路定理 electric potential energy 电势能 equipotential surfaces 等势面 electric potential gradient 电势梯度Chapter 21 potential 第八章静电场 New words and Expressions electric potential 电势 potential difference 电势差,电压 circulation theorem 环路定理 electric potential energy 电势能 equipotential surfaces 等势面 electric potential gradient 电势梯度