diference between picoammeter and electrometer?

[misha82]

what is a picoammeter

can somebody tell me the basic difference between the principle of electrometer and picoammeter?

what is the difference between the ion-current and electron-current?

-misha

 

[misha82]

what is a picoammeter?

pls reply somebody.its really urgent.thanx

 

[Kral]

misha82,
An electrometer is a device for measuring electric charge. In its most basic form, it consists of 2 pieces of metal foil.
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A picoammeter is a device for measuring low amplitude current.
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Both electron current and ion current are measures of flow of charge. The only difference is whether ions (charged atoms/molecules) or electrons are the vehicle for carrying the charge.
Regards,
Krasl

Added after 16 minutes:

misha82,
In the 3rd paragrph of my previous reply, please change "flow of charge" to "rate of flow of charge".
Regards,
Kral

 

[vicky]

hi
in electro meter you measure the electrical charge thta flow in shape of electrons
an ampere meter is as same that describe abve for measuring the low amplitude current.
while the ions current is the current that we measure in liquid having salts as much salts involve the ions are more and more flow of current occurs so the ions current is directly propotional its also a flow of charge but regards to the ionic strength in liquids.

 

[Kral]

The fundamental difference between an electrometer and a picoammeter is this:
An electrometer measures charge.
A picoammeter measures rate of change of charge, which is current.
Regards,
Kral

 

[misha82]

thanx a lot to all of u. ur ans is somewhat similar to what i was thinking.thanx a lot