Four cells with an EMF of 1.5 V are connected in parallel to form a battery. The EMF of the battery is:

Question

BlackTom AI · Accepted Answer

EMFs of identical ideal cells connected in parallel remain equal to the EMF of a single cell because all parallel branches share the same terminal voltage. EMF (electromotive force) is the open-circuit potential difference produced by a cell; connecting identical cells in parallel does not add their voltages—it increases the available current (capacity) and reduces overall internal resistance, but the terminal voltage stays the same.

Step-by-step reasoning:
1. Given: each cell has EMF E = 1.5 V and there are four identical cells.
2. Property of parallel connection: voltage across each branch is the same as the common terminal voltage. For ideal identical cells, that common terminal voltage = the EMF of one cell, E.
3. Therefore the battery EMF = 1.5 V.

Intermediate comparison calculation (to clarify common confusion):
- If the same four 1.5 V cells were connected in series, total EMF = 1.5 V + 1.5 V + 1.5 V + 1.5 V = 6.0 V. That is why option a (6 V) would be correct for series, not parallel.
- There is no way to get 4.0 V from four identical 1.5 V cells in simple series or parallel connections (option c is incorrect).
- Option d (0 V) would only occur if equal EMFs were connected directly in opposition (anti-parallel or series opposing), which is not stated here.

Why the correct answer is correct:
Because parallel connection enforces the same potential across all cells and does not sum EMFs, the resulting battery EMF equals the EMF of one cell, 1.5 V.

Conclusion: The correct answer is b. 1.5 V, which matches the provided answer.

Four cells with an EMF of 1.5 V are connected in parallel to form a battery. The EMF of the battery is:单项选择题

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