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A resistor obeys Ohm's law (\$\small V=I\cdot R\$); the current through it is equal to the voltage across it divided by the resistance (equivalently \$I=\frac{V}{R}\$).

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How do the non-circuit old Christmas lights flash?

The red-tipped bulb is a "twinkle bulb" with a bimetallic strip inside which will disconnect the circuit when the bulb heats up. Then the bulb will cool down and the bimetallic strip will close the ci …
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