For men, having basic maintenance skills is a plus. If something goes wrong, it's sure to impress others. How to distinguish between the positive and negative electrodes of a diode?

Method 1: For ordinary diodes, you can look at the body surface, and one end of the white line is the negative electrode.

Method 2: For leds, the long pin is positive and the short pin is negative.

Method 3: If the pin is cut to the same length, the small metal inside the LED tube is the positive electrode, and the large sheet is the negative electrode.

Method 4: If the eye can not see clearly because of myopia, you can also open the multimeter, turn the knob to the on-off position, and connect the red and black probes to the two pins respectively. If there is a reading, one end of the red probe is positive; If the reading is "1", one end of the black probe is positive.