Which one of the four parts (battery, switch, light bulb and wires) of a circuit can be left out while allowing the circuit to continue to function? and why is it usually inculed?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

To keep the light bulb lit, you would need the alligator clips (wires), the battery, and the the light bulb. When all of these parts of the circuit are connected so that the energy is flowing it is considered a complete or closed circuit. You do not necessarily need to...

See
This Answer Now

Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.

Get 48 Hours Free Access

To keep the light bulb lit, you would need the alligator clips (wires), the battery, and the the light bulb. When all of these parts of the circuit are connected so that the energy is flowing it is considered a complete or closed circuit. You do not necessarily need to use the switch. The purpose of the switch in this circuit, which is a series circuit, is to turn the electricity on or off. Switches are devices that make it easy to open or close an electrical circuit, therefore turning the flow of electricity on or off.

Approved by eNotes Editorial Team