Identical Cells in Parallel (Same E; 1/r_eq = sum 1/r (identical parallel))

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Same E; 1/r_eq = sum 1/r (identical parallel)

What each symbol means

SymbolWhat it stands for
E_{\mathrm{eq}}EMF (V) — same as one cell
r_{\mathrm{eq}}Equivalent internal resistance (Ω)

When to use this

Identical cells only; same polarity in parallel; ideal connecting wires.