Flashlight battery has emf E = 4.5 and

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Flashlight battery has emf E = 4.5 V and internal resistance r = 3,5 Ohm. How many of these batteries must be connected in series to feed the lamp rated for U = 127 V and power P = 60W?

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Task 30200. Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.
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