INTERNAL RESISTANCE f.6 PHY

2011-05-24 5:29 am
Q1 3粒d cell 1.5v in series 理論上多少volt??Q2 the battery contain three identical dry cells in series . what are the emf anf internal resistance of each dry cell ? explain briefly.Q3 so you think that the resistance of the connecting wire is significant error in this experimaent ? explain briefly.
更新1:

q1 3粒d cell 1.5v in series 理論上多少internal resistance ? q2 我既實驗結果係emf = 4.5v i. r.= 1ohm

回答 (2)

2011-05-24 5:56 am
✔ 最佳答案
1. 3 x 1.5v = 4.5v

2. 無法提供,除非經過測量

3. wire resistance喺咪significant就要睇電路總電流,你應知道1ohm resistance有1amp電流流過就有1volt嘅電壓降,如果電池emf係4.5volt,1volt嘅電壓降足以產生22%error,令電池emf跌至3.5volt。回第二題目,如果電池組閉路時電流係1amp,閉路導線電阻不計,電池組emf由4.5volt下降至3.5volt,咁電池組內阻就係1ohm,每一電池內阻就係0.33333333ohm,所以第二題目至少要有電壓錶同電流錶方可知曉
2011-05-24 5:50 am
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收錄日期: 2021-04-20 12:50:45
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