वोल्टमीटर
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thumb|voltamitar voltamitar (aangrezi:Voltmeter) ek vaijnanik upakaran hai. voltamitar ka avishkar haians aaurestad ne varsh 1819 mean kiya tha. yah upakaran vidyut paripath mean do bianduoan ke bich dhara ke pravah ke dauran unake bich voltej mapane ke kam ata hai.
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