HELP please!!!!?

Question

Heres some questions that have me stuck for like 2 hours now.
Can someone please help? Thanks.

What arrangement of three cells will result in the greatest electric current? Which arrangement would result in the greatest longevity (lasts longest) for the battery?

Describe three factors within a voltaic cell that you could manipulate in order to produce a cell with the highest possible voltage. For each factor describe how you would manipulate it.

Describe the advantages and disadvantages for using fuel cells compared to other types of electrochemical cells.

Answer 1

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1)-This question about the arrangement of cells into a battery is tricky - do you want a battery that is CAPABLE of supplying the most current (cells in parallel allow a greater capacity to deliver current) or do you want the arrangement that will result in the greatest current draw into a given fixed load (series connected cells create higher voltage, which results in more current flowing through a given resistance, see Ohm's law.) The question probably meant the latter, but if there is more information on what the instructor expects here, it would help.

2)-Parallel connected cells would result in the greatest battery longevity (assuming the same given fixed load.)

3)-The question about the inner workings of a cell must have to do with the chemistry of the cell. What kind of cell is it? Not enough info to answer. The size of the cell itself does indeed affect the current it can deliver, but the question referred to the voltage, which is related to the actual chemistry.

4)-Fuel cells (are we talking hydrogen fuel cells?) are similar to battery cells. Hydrogen is separated from water using electricity, then the fuel cell turns the hydrogen back into water and electricity. This is a reversible chemical process, just like a battery cell. Most battery cells, however, are much more efficient than this hydrogen process, since losses occur both from electrolysis, and in the fuel cell itself. The efficiency of this entire process is well under 50%. Batteries can approach 90% efficiency.

The only advantage a hydrogen fuel cell has over a conventional battery has to do with rapid fueling using hydrogen, as opposed to slower charging of batteries. However, new battery research is now giving us batteries that can charge in a few minutes, so even this hydrogen advantage is evaporating.
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Answer 2

HOPE THIS HELPS


A battery is a cluster of cells connected together for greater voltage and/or current capacity.
Cells connected together in series (polarities aiding) results in greater total voltage.
Physical cell size impacts cell resistance, which in turn impacts the ability for the cell to supply current to a circuit. Generally, the larger the cell, the less its internal resistance.
Cells connected together in parallel results in less total resistance, and potentially greater total current.

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By converting fuel directly into energy through an electrochemical reaction, fuel cells extract more power out of the same quantity of fuel when compared to traditional combustion. This direct process results in a reduced amount of fuel being consumed and greater efficiencies, 30% to 90%, depending on the fuel cell system and if the surplus heat is utilized

Answer 3

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