Question

 you have a battery in a lightbulb what else must you have to complete the circuit to light the bulb. Why is this component necessary?

Answer 1

Wire

Step-by-step explanation:

To make a complete circuit, you need to connect the battery, the wire, and the bulb so that electricity will have a path to flow from the bottom of the battery, through the wire, into the little wire on the side of the bulb, up that wire, through the filament, down the other bulb wire to the bottom of the bulb base