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By adding cells in series, a larger-voltage bat- tery can be made, whereas adding cells in parallel results in a battery with a higher current-output capacity.

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This is what a book that I am reading says and hence what I am understanding is Voltage is added when Voltage sources are connected in series and Current s added when voltage sources are connected in parallel.

Considering the ohm's law,

1)for V1=10v and V2=10v, R = 1K, if I keep only keep V1 as voltage source, V across R would be 10v and I(current) would be 10mA.

2)Now if I connect V1 and V2 in series , V = 20V and I would be 20mA.

Did I miss something or the current actually doubled up?

I even simulated the curcuit in the Multisim and i faced with a similiar result. Any help in understanding the concept would be helpful.

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Maximum limits is the key here not ohms law so....

Forget ohms law. Putting batteries in series has the maximum current limited by the weakest battery. We're talking about a single battery being able to supply x amps with two in series only able to the same maximum.

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  • \$\begingroup\$ So Z1 Battery with X1(Max current) and Z2 with X2(max again!), but X2<X1. So adding Z1 and Z2 in series would give me X2? as you said "Maximum current limited by the weakest battery" \$\endgroup\$ – MaNyYaCk Dec 28 '16 at 15:58
  • \$\begingroup\$ Thats what I said. \$\endgroup\$ – Andy aka Dec 28 '16 at 16:47
  • \$\begingroup\$ Forget about all that X1 and X2 stuff - we're talking weakest link in the chain and not some mathematical thing. \$\endgroup\$ – Andy aka Dec 28 '16 at 17:05
  • \$\begingroup\$ I think I confusing myself. I think theoritically I wouldn't be able to understand. Could you suggest me a practical way (like putting batteries togather or in parallel) and where to connect multimeter and what to measure for better understanding? \$\endgroup\$ – MaNyYaCk Dec 28 '16 at 17:17
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    \$\begingroup\$ Measurements have nothing to do with it. If the manufacturer says 1 amp maximum and you have two batteries in series, they share the same current and that maximum current should not be greater than 1 amp. Having twice the voltage across the same resistor does double the current but this current should not exceed the maximum specified by the manufacturer. \$\endgroup\$ – Andy aka Dec 28 '16 at 17:21
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You are correct that increasing voltage (putting batteries in series) would increase current across a resistor.

The batteries in series isn't adding current the way you're maybe thinking. Batteries have a max current they can deliver which you could find in a datasheet. Adding more batteries in series means they each can deliver up to their max current and the total current-output capacity increases. In parallel will also extend the life of your battery - again something like this can be found in the datasheet: enter image description here

You can see if you are running your battery at a lower current it will extend battery life.

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