Combination Of Cells

Question

Three cells each of EMF 2 V and internal resistance 1 Ω are connected in series. What is the total EMF and internal resistance?

RankGuru · Accepted Answer

1. **Cells in Series Rule**: When cells are in series assisting each other:
   - Total EMF: $E_{net} = E_1 + E_2 + E_3$
   - Total Internal Resistance: $r_{net} = r_1 + r_2 + r_3$
2. **Calculation of EMF**:
   - $E = 2 + 2 + 2 = 6 	ext{ V}$.
3. **Calculation of Resistance**:
   - $r = 1 + 1 + 1 = 3 	ext{ } \Omega$.
4. **Result**: The equivalent battery has 6 Volts and 3 Ohms of internal resistance.

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Combination Of Cells

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