If the bulb is in series with something else, then . . .
-- The brightness of the bulb depends on the other device in the circuit.
-- If the other device is designed to use less power than the bulb, then the
other device gets more power than the bulb gets.
-- If the other device is designed to use more power than the bulb, then the
other device gets less power than the bulb gets.
-- If the other device is removed from the circuit, then the bulb doesn't light at all.
This description of the often-screwy behavior of a series circuit may partly explain
why the electric service in your home is not a series circuit.
