电子信息技术专业英语丁宁主编习题答案 Exercise AnswersPart one ElectronicsUnit 1 Charge, Current and VoltageExercises1.(1)positive and negative particles (2)the time rate of change of charge (3)自由电子 (4)potential difference (5)以随机的方式运动2. (1)voltage (2)positive (3)negative (4)conductor (5)current3. (1)which -atom (2)it-balloon (3)it-The unit of voltage, or potential difference (4)which-a wall or the ceiling (5)it-the charge of an electron is a negative
