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Question
An electric cell does 5 joules of work in carrying 10-coulomb charge around the closed circuit. The electromotive force of the cell is :
An electric cell does 5 joules of work in carrying 10-coulomb charge around the closed circuit. The electromotive force of the cell is :
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Solution
The correct option is B 0.5 volt
Answer is B.
The electromotive force (e) or e.m.f. is the energy provided by a cell or battery per coulomb of charge passing through it, it is measured in volts (V). It is equal to the potential difference across the terminals of the cell when no current is flowing.
e = E/Q
e = electromotive force in volts, VE = energy in joules, JQ = charge in coulombs, C
In this case, work done = 5 J and amount of charge = 10 C.
Therefore, e = 5/10 = 1/2.
Hence, electromotive force of the cell is 1/2 volt.
Answer is B.
The electromotive force (e) or e.m.f. is the energy provided by a cell or battery per coulomb of charge passing through it, it is measured in volts (V). It is equal to the potential difference across the terminals of the cell when no current is flowing.
e = E/Q
e = electromotive force in volts, VE = energy in joules, JQ = charge in coulombs, C
In this case, work done = 5 J and amount of charge = 10 C.
Therefore, e = 5/10 = 1/2.
Hence, electromotive force of the cell is 1/2 volt.
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