某实验小组利用如图1所示的电路图“观察电容器的充放电现象”. https://bgk-photo.cdn.bcebos.com/314e251f95cad1c852137d466f3e6709c93d5123.jpghttps://bgk-photo.cdn.bcebos.com/960a304e251f95ca257f13d7d9177f3e660952cd.jpg若将开关S打到1,隔一段时间后再将电键打到2,试在图2中画出电流传感器显示的电流随时间变化图线.https://bgk-photo.cdn.bcebos.com/738b4710b912c8fcc67677acec039245d78821cd.jpg通过改变电路中元件的参数https://bgk-photo.cdn.bcebos.com/024f78f0f736afc34da7be04a319ebc4b7451223.jpg电阻R或电源https://bgk-photo.cdn.bcebos.com/5bafa40f4bfbfbed84dcb71e68f0f736aec31fcd.jpg对同一电容器进行两次充电,对应的https://bgk-photo.cdn.bcebos.com/42a98226cffc1e17b73a0d505a90f603728de9ce.jpg曲线如图3中https://bgk-photo.cdn.bcebos.com/54fbb2fb43166d223bdc94f5562309f79052d22c.jpg所示. https://bgk-photo.cdn.bcebos.com/0b7b02087bf40ad102614682472c11dfa8eccece.jpg https://bgk-photo.cdn.bcebos.com/2934349b033b5bb55b7ca19f26d3d539b600bc2c.jpg两条曲线不同是______https://bgk-photo.cdn.bcebos.com/6a600c338744ebf89df4e55ec9f9d72a6159a7ce.jpg选填E或https://bgk-photo.cdn.bcebos.com/ac345982b2b7d0a2a06285fcdbef76094b369a2c.jpg的改变造成的;https://bgk-photo.cdn.bcebos.com/55e736d12f2eb93824c6fb93c5628535e5dd6f2c.jpg电容器有时需要快速充电,有时需要均匀充电.依据a中的结论,快速充电时选择R_____,而需要均匀充电时,选择电阻R_________https://bgk-photo.cdn.bcebos.com/2cf5e0fe9925bc318af680f94edf8db1cb13702c.jpg选填“大”、“小”https://bgk-photo.cdn.bcebos.com/5d6034a85edf8db111abfd051923dd54574e74ce.jpg. https://bgk-photo.cdn.bcebos.com/241f95cad1c8a7863fafcb6f7709c93d71cf50ce.jpg设想使用理想的“恒流源”替换中图1中电源对电容器充电,可实现电容器电荷量随时间均匀增加.则使用“恒流源”对电容器的充电过程中电源两端电压_____https://bgk-photo.cdn.bcebos.com/a5c27d1ed21b0ef40b6c193fcdc451da80cb3ece.jpg选填“增大”、“减小”或“不变”https://bgk-photo.cdn.bcebos.com/d50735fae6cd7b89bee8bbe21f2442a7d8330ece.jpg.⏺