how does the type of circuit affect the strand of Christmas lights with a burned out bulb?

A parallel circuit exists whenever two or more components are connected between the same two points.

IV is the type of circuit and DV is the lights lit up.

If the circuit is parallel in which all the lights will be lit.

If the strand used series circuit then the lights wouldn't lit up.

Without any light it was dark and no lights would be lit.

first test all the lights were lit up.

second screen shot two lights were lit.

lights were very dim. On the third screen shot

on the fourth screen shot none of the lights were lit up.

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