Physics · Current Electricity
Consider two cells of emf ε1 and ε2 with internal resistances r1 and r2, respectively. If the two cells are connected in parallel by connecting their positive terminals together and their negative terminals together, the combination is equivalent to a single cell with an equivalent emf of:
- 1ε2 r1r1 + r2
- 2ε1 r1 + ε2 r2r1 + r2
- 3ε1 r2 + ε2 r1r1 + r2✓
- 4ε1 r2r1 + r2
Correct answer
ε1 r2 + ε2 r1r1 + r2
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