Flashlight batteries. A typical small flashlight contains two batteries, each having an emf of 1.5 V , connected in series with a bulb having resistance 17Ω. (a) If the internal resistance of the batteries is negligible, what power is delivered to the bulb? (b) If the batteries last for 5.0 h, what is the total energy delivered to the bulb? (c) The resistance of real batteries increases as they run down. If the initial internal resistance is negligible, what is the combined internal resistance o
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