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LEDs are semiconductor devices that behave like diodes. In general they have a 1.7 volt forward voltage drop (anode+ to cathode-)when conducting and emitting light. When they are connected together in a series type electrical connection you must obey the polarity (connect cathode of each to anode of next diode)and be certain you don't exceed the allowable reverse voltage rating of the device as well as the forward allowable current. Therefore to use LEDs in a 120 Volt AC household circuit The peak voltage will be 170 volts and you will need 170/1.7 = 100 LEDs connected in series. You will also need 100 LEDs wired in the opposite polarity to avoid exceeding the reverse voltage. Half the LEDs will light on each of the AC cycles.

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