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.

And this Image

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.


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.

  • \$\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
  • 2
    \$\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

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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