How to check positive and negative voltage

How to check positive and negative voltage:

This is the circuit for checking the voltage. this circuit is for polarity checking for the negative and positive voltage. sometimes we have to check the voltage polarity wire when we use the same color wire for the voltage. normally it happens for the car wire. car electric technician always uses this circuit to check the wire polarity.

How to check positive and negative voltage

This is a simple circuit but so important circuit diagram.

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It's me. I like electronics. I like to repair electronics. I like to make circuit diagram. it's me who sleep with electronics. electronics is my dream. Always resistor diode capacitor and transistor playing in my dream. It's me (Ramen Bairagee)

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