Question

why do bulbs have two terminals

Answer 1

An electric current cannot flow through this circuit. Two terminals: An electric cell has two terminals, a negative terminal and a positive terminal (as shown in the given figure).

Answer 2

$hello$
It’s like the one-way lanes
through parking lot of a store_ the electrons that make up the electrical flow that the lights lamp have to a way out of the battery, into one terminal of the light bulb, though the filament of the bulb to light it up, out the other terminal and back to the battery. A one-way flow all they way, and they can’t go out through the same lane they came in.

$thanku$