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A battery has an internal resistance of 0.20 Ώ. A number of 3 identical light bulbs,...

A battery has an internal resistance of 0.20 Ώ. A number of 3 identical light bulbs, each with a resistance of 10.0 Ώ, are connected in parallel across the battery terminals. If the emf of the battery is 12.0 V. Determine the terminal voltage V.  

                              (tip: get the equivalent resistance of the circuit with the emf as the battery)

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