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I know it's a very stupid question but I am confused a little bit right now.

An ideal cell has constant EMF of 7V. When connected in a circuit, the voltage across the cell decreases to 5V.

Can i say that the new EMF of the cell is 5V?

please consider the cell as a non-ideal cell

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  • $\begingroup$ Not sure what you mean by ideal cell if the voltage across depends on the current through. $\endgroup$ Nov 19, 2016 at 13:32

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In an ideal cell the internal resistance is zero. According to the equation $V=E-Ir$ the $I*r$ term is always zero for an ideal cell. So, there can not be any voltage drop across the cell after connecting to a circuit that means $V$ is always equal to EMF.

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