Question
Sun August 21, 2011 By: Moksha Sharma

Can we use a voltmeter to measure emf of the cell.Justify ur answer

Expert Reply
Mon August 22, 2011

The electromotive force (emf) of a cell is its terminal voltage when no current is flowing through it. The terminal voltage of a cell is the potential difference between its electrodes. A voltmeter cannot be used to measure the emf of a cell because a voltmeter draws some current from the cell. To measure a cell's emf a potentiometer is used since in a potentiometer measurement no current is flowing. It employs a null method of measuring potential difference, so that when a balance is reached and the reading is being taken, no current is drawn from the source to be measured.

 

Related Questions
Tue August 30, 2016

Kindly answer the question.

Ask the Expert