Amperage = # of bulbs x wattage of each bulb / 110 volts.
Incandescent - Perm-O-Snap and Bethlehem Mini Light Sets
35-light Mini Set = 120 Volts, .20 Amps, 24 Watts
50-light Mini Set = 120 Volts, .20 Amps, 24 Watts
100-light Mini Set = 120 Volts, .40 Amps, 48 Watts
LED - FLEXCHANGE™ and non-replaceable LED light sets
25-light set = 120 Volts, .02 Amps, 2.4 Watts
35-light set =.120 Volts, .02 Amps, 2.4 Watts
50-light set = 120 Volts, .04 Amps, 4.8 Watts
Note: The average outlet in a house has 20 Amp service