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Question
when the pointer of galveno meter travel toward right or sometime..towrds left..for what reason it towards right or left??

Answer
Direction of current.  To plus means current is going into the plus terminal, etc.

The pointer is driven by a coil in a magnetic field and the force generated is a function of the direction and magnitude of the current. If you reverse the connections to the galvo meter it will reverse the current and send the needle the opposite direction.

http://en.wikipedia.org/wiki/Galvanometer

Hope this helps.  

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Electronics questions about AC, DC and digital theory.

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Graduate electrical engineer with over 40 years in electronic design, manufacturing, project organization and patent review. Experience in fields of industrial and consumer electronics (audio, video, acoustics, etc.)

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IEEE (Institute of Electrical and Electronics Engineers); Senior Life member AES (Audio Engineering Society), Fellow Life member

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BSEE University of North Dakota

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