Cells in Series (Assisting) (E_eq = sum E; r_eq = sum r (series aiding))

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E_eq = sum E; r_eq = sum r (series aiding)

What each symbol means

SymbolWhat it stands for
E_iIndividual EMFs (V)
r_iIndividual internal resistances (Ω)
E_{\mathrm{eq}}Net EMF (V)
r_{\mathrm{eq}}Net internal resistance (Ω)

When to use this

Cells connected aiding (positive to negative); identical polarity chain.