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A bettery of emf 10 V and internal resistacne 3 Omega is connected to a resistor. Ifthe current in the circuit is 0.5A, what is the resistance of the resistor ? What is the terminal voltage of the bettery when the circuit is closed ? |
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Answer» Solution :For the adjoining closed LOOP, `I = (EPSILON)/(R + r)` `THEREFORE R +r = (epsilon)/(I)` `therefore R = (epsilon)/(I) -r ` = `(10)/(0.5) - 3 ` `therefore R = 17 Omega` Terminal voltage of battery, `V_(ab) = IR ` = (0.5) (17) = 8.5 V OR V = `epsilon - `Ir `= 10 - (0.5) (3)` = 10 - 1.5 = 8.5 Volt |
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