With a 1400 M ? resistor across its terminals, the terminal voltage of a certain

Question

With a 1400M? resistor across its terminals, the terminal voltage of a certain battery is 2.63V . With only a 5.20? resistor across its terminals, the terminal voltage is 1.68V . Part A Find the internal emf of this battery. E =   V   SubmitMy AnswersGive Up Part B Find the internal resistance of this battery. r =   ?   SubmitMy AnswersGive Up Part C What would be the terminal voltage if the 5.20? resistor were replaced by a 7.20? resistor? V3 =   V   With a 1400M? resistor across its terminals, the terminal voltage of a certain battery is 2.63V . With only a 5.20? resistor across its terminals, the terminal voltage is 1.68V . With a 1400M? resistor across its terminals, the terminal voltage of a certain battery is 2.63V . With only a 5.20? resistor across its terminals, the terminal voltage is 1.68V . With a 1400M? resistor across its terminals, the terminal voltage of a certain battery is 2.63V . With only a 5.20? resistor across its terminals, the terminal voltage is 1.68V . With a 1400M? resistor across its terminals, the terminal voltage of a certain battery is 2.63V . With only a 5.20? resistor across its terminals, the terminal voltage is 1.68V . Part A Find the internal emf of this battery. E =   V   SubmitMy AnswersGive Up Part B Find the internal resistance of this battery. r =   ?   SubmitMy AnswersGive Up Part C What would be the terminal voltage if the 5.20? resistor were replaced by a 7.20? resistor? V3 =   V   Part A Find the internal emf of this battery. E =   V   SubmitMy AnswersGive Up Part B Find the internal resistance of this battery. r =   ?   SubmitMy AnswersGive Up Part C What would be the terminal voltage if the 5.20? resistor were replaced by a 7.20? resistor? V3 =   V   Part A Find the internal emf of this battery. E =   V   SubmitMy AnswersGive Up Part B Find the internal resistance of this battery. r =   ?   SubmitMy AnswersGive Up Part C What would be the terminal voltage if the 5.20? resistor were replaced by a 7.20? resistor? V3 =   V   Part A Find the internal emf of this battery. E =   V   SubmitMy AnswersGive Up Part B Find the internal resistance of this battery. r =   ?   SubmitMy AnswersGive Up Part C What would be the terminal voltage if the 5.20? resistor were replaced by a 7.20? resistor? V3 =   V   Part A Find the internal emf of this battery. E =   V   SubmitMy AnswersGive Up Part A Find the internal emf of this battery. E =   V   SubmitMy AnswersGive Up E =   V   E =   V   SubmitMy AnswersGive Up Part B Find the internal resistance of this battery. r =   ?   SubmitMy AnswersGive Up Part B Find the internal resistance of this battery. r =   ?   SubmitMy AnswersGive Up r =   ?   r =   ?   SubmitMy AnswersGive Up Part C What would be the terminal voltage if the 5.20? resistor were replaced by a 7.20? resistor? V3 =   V   Part C What would be the terminal voltage if the 5.20? resistor were replaced by a 7.20? resistor? V3 =   V   V3 =   V   V3 =   V   With a 1400M? resistor across its terminals, the terminal voltage of a certain battery is 2.63V . With only a 5.20? resistor across its terminals, the terminal voltage is 1.68V . Part A Find the internal emf of this battery. E =   V   SubmitMy AnswersGive Up Part B Find the internal resistance of this battery. r =   ?   SubmitMy AnswersGive Up Part C What would be the terminal voltage if the 5.20? resistor were replaced by a 7.20? resistor? V3 =   V  

Explanation / Answer

Let the internal emf be E and the internal resistance be r.

Case 1:

1400 mohm= 1.4 ohms

So E/(1.4 +r) = 2.63/1.4

E= 2.63 + 1.878 r

Case 2:

E/5.2+r= 1.68/5.2

E= 1.68 +0.323 r

From case 1 and 2 :

internal resistance r= 0.61 ohm

emf E= 1.877 V

If 5.3 ohm is replaced by 7.2 ohm

(1.877* 7.2)/ (7.2 + 0.61)

=1.73 V

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