Electronics > Beginners

Why does a battery need to be in a circuit loop to work?

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roogadget:
This is a simple one that I don't get.  :P

Why can't I connect the positive terminal of one 12V battery to the negative terminal of another 12V battery?

Why does it need to be in a loop?

6PTsocket:

--- Quote from: roogadget on September 28, 2018, 11:34:28 am ---This is a simple one that I don't get.  [emoji14]

Why can't I connect the positive terminal of one 12V battery to the negative terminal of another 12V battery?

Why does it need to be in a loop?

--- End quote ---
What do you mean by "work"? Because of the potential difference between the terminals, if you connect a device across it current flows through it. That is your loop. If nothing is connected there is no flow. Batteries can be daisy chained (wired in series) plus to minus for higher voltage. I am not sure I am clearing up what is confusing you.

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roogadget:
I was confused about why it needs to be in a loop.

By "work", I mean current flowing from one terminal to another.

After reading more online about uniform electric fields and electric potential. I've come to a better understanding  now.
The loop is required to maintain the electric field required for current to flow.

https://www.physicsclassroom.com/class/circuits/Lesson-1/Electric-Potential-Difference

Thanks!

Keosintal:
I understand what you're trying to say. It's like connecting two AAs in series. The +ve of battery 1 touching the -ve of battery 2, but they don't short circuit. Am I right?

roogadget:
correct :)

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