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* $$
\varepsilon=V_{a b}=I R
$$
                         $$
\text { (ideal source of emf) }
$$

* $$
V_{a b}=\varepsilon-I r
$$
            $$
\text { (terminal Voltoge. }
$$$$
\text { Source with internal resistance) }
$$

* $$
\varepsilon-I r=I R
$$
        OR        $$
I=\frac{\varepsilon}{R+r}
$$
        $$
\text { (Current, Source with internal resistomce) }
$$

 

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