the terminal voltage of a battery is 5.0 V when 0.55 A current is drawn from it,
ID: 1769468 • Letter: T
Question
the terminal voltage of a battery is 5.0 V when 0.55 A current is drawn from it, whereas the terminal voltage is 5.7 V when a current of 0.180 A is drawn. 1. What is the emf of the battery? 2. What is the internal resistance of the battery? the terminal voltage of a battery is 5.0 V when 0.55 A current is drawn from it, whereas the terminal voltage is 5.7 V when a current of 0.180 A is drawn. 1. What is the emf of the battery? 2. What is the internal resistance of the battery? 1. What is the emf of the battery? 2. What is the internal resistance of the battery?Explanation / Answer
terminal voltage
V = E - I r
if V = 5 V I = 0.55 A
5 V = E - 0.55 r ..... (1)
5.7 V = E - 0.18 r ..... (2)
substract 2 - 1
o.7 = (0.55 - 0.18 ) r
internal resistance
r = 2.1875 ohm
emf E = 5.7 + ( 2.1875 ) ( 0.18 ) = 6.09 V
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