高考物理总复习-高中全程训练计划-物理-课练 25 实验:测定电源的电动势和内电阻
课练25 实验:测定电源的电动势和内电阻 练习使用多用电表小题狂练○小题是基础 练小题 提分快1.[2019·河南省豫南九校检测]某兴趣小组的同学制作了一个“水果电池”:将一铜片和一锌片分别插入一苹果内,就构成了一个简单的“水果电池”,其电动势约为1.5V,内阻约为几百欧,现要求用量程合适的电压表(内阻几千欧)、电流表(内阻十几欧)来测定水果电池的电动势E和内阻r.①本实验的电路应该选择图________(选填“甲”或“乙”).②若给出的滑动变阻器有两种规格:A(0~20Ω)、B(0~3kΩ).本实验中应该选用的滑动变阻器为________,通电前应该把滑动变阻器的阻值调至________(选...
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