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How to properly connect LEDs, how to calculate a resistor for a LED, what types of connection schemes are there. How to properly connect an LED to a 220-volt outlet. Little-known nuances and well-known facts are considered, the video is more suitable for beginners, since everything is explained as simply as possible. Several schemes for connecting LEDs in groups are shown, a parallel connection with one resistor, parallel with a resistor for each LED, serial with the selection of the number of LEDs for voltage.