- #1
nutzweb
- 12
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need everyone's help... pls. explain it to me for those who knows the experiment...thanks!
1) in measuring emf by slide-wire potentiometer, why should the working battery have a voltage greater than 2? why is the galvanometer polarity unimportant?
2)how is the function of a rheostat different from a galvanometer?
3)under what condition is a voltmeter more desirable than apotentiometer for the measurement of voltages?
lastly,
4)how can i prove that the potentiometer measures the emf of the test cell and not its TPD? where do i start in solving this?
guys, pls. help. physics really kills me. really not good in physics i guess...
1) in measuring emf by slide-wire potentiometer, why should the working battery have a voltage greater than 2? why is the galvanometer polarity unimportant?
2)how is the function of a rheostat different from a galvanometer?
3)under what condition is a voltmeter more desirable than apotentiometer for the measurement of voltages?
lastly,
4)how can i prove that the potentiometer measures the emf of the test cell and not its TPD? where do i start in solving this?
guys, pls. help. physics really kills me. really not good in physics i guess...