Cells are connected in series in order to

Question

Examoogle · Accepted Answer

Option A: increase the voltage rating

Explanation & Concepts:
When cells are connected in series, the total voltage of the combination is the algebraic sum of the individual voltages of the cells. This configuration allows a battery bank to achieve a higher voltage output than a single cell can provide.

Working Principle: In a series circuit, the same current flows through all components, but the voltage potential adds up across the series chain. If $n$ identical cells each with electromotive force $E$ and internal resistance $r$ are connected in series, the equivalent emf becomes $E_{eq} = nE$ and the equivalent internal resistance becomes $R_{int} = nr$. This increases the potential difference available to drive current through an external load.

Key Formulas: $V_{total} = \sum_{i=1}^{n} V_i$ — Total voltage in a series circuit; $I_{total} = I_1 = I_2 = ... = I_n$ — Current constraint in a series circuit

Key Points: Series connection increases voltage rating while maintaining the same current capacity as a single cell.; Internal resistance in a series connection also adds up, which can lead to higher power loss within the battery bank.; This method is used in high-voltage applications like DC motor drives or inverters.

Advantages: Increased output voltage; Suitable for high-power DC load applications

Disadvantages: Increased total internal resistance; Failure of a single cell can open the circuit and stop the entire stack

Applications: Flashlights requiring higher voltage; Battery packs for Electric Vehicles (EVs); UPS systems

Additional Info: Option B (increase current rating) is incorrect because current capacity is increased by connecting cells in parallel.. Option C (increase life) is managed by circuit design and cell balancing, not simply by series connection.

Answer: A is correct — Connecting cells in series adds their individual electromotive forces, resulting in an increased total voltage rating for the circuit.

Exam Tip: Always remember: Series = Voltage summation (Current stays same); Parallel = Current summation (Voltage stays same).

Examoogle · Answer

Option B: increase the current rating

Examoogle · Answer

Option C: increase the life of the cells

Examoogle · Answer

Option D: none of the above

Correct Answer

Discussion (0)

Correct Answer

Related Questions

Discussion (0)