Answer Posted / ishant aggarwal

It can be understood with the help of resistance as Every battery has internal resistance lets r1 r2 & r3, connected in series, thus R = r1+r2+r3. LETS output voltage is V and current is I Amps.
As by ohms law V=IR

V/I = v1/I + v2/I + v3/I ( current is same in series connection)

i.e. V= v1+v2+v3

Thus, voltages are added when batteries are connected in series.

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