Experts say "current depends on voltage". So, if the voltage is high, current would be high. Agreed; (I = V/R)
If the voltage is low, the current would also be low. Agreed -> I = V/R
But why then do two different batteries available with the same voltage (say 2 V) not deliver the same current?
If the voltage is same for two different batteries, current should also be the same, right?
Which factor plays the role in delivering a different current for these batteries?
If two different batteries (with the same voltage) delivers different currents, how can we say that they are both 2 V batteries?
Why do the batteries not obey the rule? Do they have another principle?
Best Answer
True, if you're asking about resistance.
But, you're asking about a (non-ideal) voltage source - a battery.
The voltage to current relationship of a battery depends on the chemistry, temperature, etc. Cells and batteries are not resistors.
Now, it is the case that a first approximation of a battery is an ideal voltage source in series with an ideal resistor, as another answer points out, but it must be kept in mind that this effective resistance depends on a number of factors. See, for example this.
You've answered your question yourself. They have the same open-circuit voltage.
Clearly, two identical cells connected in parallel provide the same open-circuit voltage as one of the cells but two cells in parallel can provide twice the short-circuit current of the single cell.