In the us the standard power from an outlet is 120 volts.
Voltage detector for led christmas lights.
48 times 2 5 equals 120 and so it logically follows that a single strand will equal the standard number of volts from an outlet.
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Volts amps and watts of christmas lights.
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Traditionally a string of 48 mini bulbs uses 2 5 volts.
When this happens use a non contact voltage detector to determine exactly which light bulb is faulty.