Does the emf of a battery remain its specified value for a long time?

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The emf of a battery does not remain constant over time; it decreases as the battery discharges. When connected to an external resistor, the battery's emf will continuously decline due to the depletion of chemicals within. Initially, a battery's emf rises from zero to its specified value during charging. As the battery is used, its capacity diminishes, leading to a reduction in emf. Ultimately, the decrease in emf is a natural consequence of energy consumption and chemical reactions within the battery.
sArGe99
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Does the emf of a battery remain its specified value for a long time. It is under discharging when connected to the external resistor, so shouldn't its emf value continuously decrease in that case?

A battery's emf value increases from 0(completely discharged state) to the specified value. Isn't this what's called charging?
 
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sArGe99 said:
Does the emf of a battery remain its specified value for a long time. It is under discharging when connected to the external resistor, so shouldn't its emf value continuously decrease in that case?

A battery's emf value increases from 0(completely discharged state) to the specified value. Isn't this what's called charging?

Well the chemicals within the battery can run out, that is why the emf decreases over time. Which is why batteries run out of energy.
 

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