Which apparatus is used to measure the electromotive force of electric cell?
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It is known that connecting a voltmeter directly to the terminals(without any other load) of a battery will show you the value of the battery's EMF.However,I don't really undrerstand how this happens.The electomotive force is equal with:E=U+u(E=EMF,u=internal voltage drop,U=external voltage drop).The voltage the battery supplies is U.
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