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ββFormulae
The [[Terminal Voltage|terminal voltage]] of an [[Electrical Cell|electrical cell]] or [[battery]] is related to '''emf''' by the following formula:
*<math>π=πΈβπΌπ\varepsilonβπΌπ</math>
Where:
*π is the [[Terminal voltage|terminal voltage]]
*πΌ is the [[Electrical Current|current]] through between the terminals
*π is the [[Internal Resistance|internal resistance]] of the [[Power Supply|power supply]]