DC Circuit MCQ -measure the e.m.f of a cell with a voltmeter

Thursday, 28 November 2013

DC Circuit MCQ Short Questions Answers


Can you measure the e.m.f of a cell with a voltmeter? 


Not exactly, it's the reason that when a voltmeter is connected across the cell, current starts flowing through it. This causes the voltage drop across the internal resistance of the cell. Consequently, the voltmeter indicates not EMF cell. Keep in mind EMF of a cell is the voltage across the terminals of the cell open circuit. Example: a voltage across the terminals of a cell when it is not a current topic.

                                                            
Fig: Multimeter

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