11. The e.m.f. of an element is 6 V. When the external resistance is 1.1 Ohm the current in the circuit is equal to 3 A. Find the potential drop inside the element and its resistance.
"I=\\frac{\\varepsilon}{R+r},\\implies"
"r=\\frac{\\varepsilon}I-R=0.9~Ohm,"
"U_r=\\varepsilon\\frac r{R+r}=2.7~V."
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