When a light bulb is connected across the terminals of a, Physics

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When a light bulb is connected across the terminals of a

When a light bulb is connected across the terminals of a battery, the battery delivers 20 W ofpower to the bulb. A voltage of 12.8 Vexists between the terminals of the battery, which has an internalresistance of 0.14 Ω. What is the emf of the battery?

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