Question

which device manages the flow of current in an electric circuit?
the wire
the switch
the battery
the light bulb

Explanation:

• A wire is a conductor that allows current to flow but does not manage its flow.
• A switch can open or close a circuit, thus controlling (managing) the flow of current.
• A battery is a source of electrical energy (provides voltage to drive the current), not a manager of current flow.
• A light - bulb is a load that uses electrical energy (converts it to light and heat), not a device for managing current flow.

Answer:

the switch