Let the current in the circuit be I amperes.
(1) VT = I Rexternal => I = VT / Rexternal = 10 / 5.60 = 1.786 A
(2) Let the EMF of the battery be denoted by E.
VT = E - I * Ri
=> E = VT + I * Ri = 10 + (1.786 * 0.2) = 10 + 0.357 = 10.357 V
This is solved by the terminal Voltage VI , Rexternal, Ri..
We use this formula :
VT / Rexternal by putting values we get 1.786 A current.
Now we find EMF of a battery:
VT = EMF - I * Ri and rearrange this formula!
EMF = VT + I * Ri
We get the EMF of a battery around 10.357 V..
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