If a DC wire is cut?

So i wanted to understand if i cut open a 12V DC adapter will i be able to differentiate which wire is positive and which is negative? and if I would be able to tell which is which, then would i be able to connect the wires directly to a 12 v battery without destroying something?

Answers

If all you want to do ermine is polarity, then use a DC voltmeter of the appropriate voltage range. Or use a multimeter. Or use an LED test light. You can even use a potato!

Philomel

What are you trying to accomplish? If you are trying to charge the battery you need lots more information about the DC adapter and the battery to do that. The simple answer is that you don't know enough to do it properly. You could start a fire and burn your house down... or up.

lee26loo，異域秦後人

YOU NEED A BASIC TOOL CALLED DC VOLTMETER TO TELL ITS POLARITY ! MAKES NO HARM TO 12V BATTERY IF 12V ADAPTOR POSITIVE OUTPUT IS CONNECTED TO BATTERY POSITIVE TERMINAL. IF BY MISTAKE TO CONNECT 12V ADAPTOR NEGATIVE OUTPUT TO BATTERY POSITIVE TERMINAL, THAT SHALL DISCHARGE THE 12V BATTERY AFTER A DAY OR MORE AS THE POWER ADAPTOR IS POWERED UP.

marty

Yes you can. I've done it alot. The wire with markings is the hot wire(positive)

rick29148

yep, one wire will be 'marked' somehow .........................

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