In an electric circuit, a call of certain emf provides a potential difference of 1 . 25 V across a load resistance of 5 Ω . However, it provides a potential difference of 1 V across a load resistance

Question

In an electric circuit, a call of certain emf provides a potential difference of 1 . 25 V across a load resistance of 5 Ω . However, it provides a potential difference of 1 V across a load resistance of 2 Ω . The emf of the cell is given by x 10 V . Then the value of x is .

TestHub · Accepted Answer

Terminal voltage, v = i R = E R R + r 1 s t → 1 . 25 = E ( 5 ) 5 + r … i 2 nd → 1 = E ( 2 ) 2 + r … ii By i and ii , r = 1 Ω , E = 3 2 V = 15 10 volt ⇒ x = 15

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