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Two 1.50 V batteries -- with their positive terminals in the same direction -- are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.230 omh the other an internal resistance of 0.150 ohm. When the switch is closed, a current of 600 mA occurs in the lamp.

(a) What is the lamp's resistance?

_____ ohm

(b) What fraction of the chemical energy transformed appears as internal energy in the batteries?

_______%

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