Charger from a laptop, how to understand where + and where -?

Question

Electronics

Can you tell me how to determine two "holes" in the data in the pictures, where is plus and minus?

Answer 1

This is a non-native charge and usually + and - are marked on them.

Answer 2

The safest thing to do is with a multimeter.

Answer 3

It's best to call with a multimeter. And if there is no multimeter, then you can simply put your finger on it. The voltage there is not large, it will not kill with a current, but it will splinter a little. It seems to me. in most cases, + in housing a - is fed to the plug shell. (This is not accurate).

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