If you connect two identical storage batteries together in parallel, and place them in a circuit, the combination will provide

Question

BlackTom AI · Accepted Answer

Connecting two identical batteries in parallel keeps the terminal voltage the same but adds their stored charge (capacity). Key concepts: battery voltage is determined by its electrochemical cell potential; capacity (charge or ampere-hours) is an additive quantity when cells share the same voltage; internal resistances in parallel combine like resistors.

1) Relevant knowledge points
- Voltage of identical ideal sources in parallel remains the same as each source (open-circuit voltage does not add in parallel; it adds in series).
- Charge/capacity (measured in coulombs or ampere‑hours) adds when cells are paralleled because both contribute current to the load.
- Internal resistance r of identical batteries in parallel becomes r_eq = r/2, increasing possible output current but not the open-circuit voltage.

2) Step-by-step reasoning
- Let each battery have voltage V and capacity C (in ampere‑hours, Ah). 
- Parallel connection: positive terminals joined, negative terminals joined → same potential difference V across the combined terminals.
- Capacities add: total capacity = C_total = C1 + C2 = C + C = 2C.
- Internal resistances r in parallel: r_eq = (r·r)/(r + r) = r/2, so the combination can deliver more current for a given load, but the nominal terminal voltage remains V.

3) Example calculation (intermediate steps)
- Suppose each battery is 1.5 V and 2.0 Ah (2.0 A for 1 hour).
- Combined parallel battery: voltage = 1.5 V (unchanged).
- Combined capacity = 2.0 Ah + 2.0 Ah = 4.0 Ah.
- In coulombs: each has Q = 2.0 A·3600 s = 7200 C; combined Q_total = 2·7200 = 14400 C.

4) Why the correct answer is correct
- Parallel adds capacity (charge) but does not raise cell potential; therefore you get the same voltage and twice the total charge.

5) Why other choices are incorrect
- "Twice the voltage..." options describe series connection, not parallel.
- "Half the voltage..." is incorrect for parallel (would be if something were divided, but not here).
- "Twice the voltage and the same total charge" mixes series voltage addition with incorrect capacity behavior for that configuration.

6) Conclusion
The correct choice is: the same voltage and twice the total charge that one battery would. This matches the provided answer.

If you connect two identical storage batteries together in parallel, and place them in a circuit, the combination will provideSingle choice

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