Circuits Intro

What is an electrical circuit?

• lets you turn the energy on and off
• a closed path where where electricity flows
• stop electricity from flowing through

A complete circuit has .......

• a motor in it
• a switch in it
• two bulbs in it
• no breaks in it

This circuit has a battery, buzzer, and switch.
When the switch is closed the buzzer will sound because -

• the switch gives energy to the battery
• the buzzer is made of special plastic
• the wires are cooled by the surrounding air
• electricity can flow in a complete path

An incomplete circuit is shown.
To complete the circuit, a wire should be placed from —

• Point D to Point C
• Point B to Point C
• Point A to Point D
• Point B to Point D

Choose the correct sentence.

• This circuit will work because it is an open circuit.
• This circuit will work because it is a closed circuit.
• This circuit will NOT work because it is an open circuit.
• This circuit will NOT work because it is a closed circuit.

Is the following photo of an open circuit or closed circuit? 

• A closed circuit which allows electricity to flow
• An open circuit which does not allow electricity to flow

Why won’t the light bulb in the circuit pictured to the right light up?

• The wires from the second light bulb are not connected to the battery
• The wires are not connected between the light bulbs 
• The wires are not connected to both sides of the first light bulb
• The wires are too long to complete the circuit 

The diagram shows a series circuit with three lit bulbs. How many of the bulbs will remain lit if the wire is cut a the point shown by the arrow?

• 0

• 1

• 2

• 3

A student builds a circuit made up of a battery, two light bulbs, and a switch. What will the student most likely observe in this circuit?

• Light bulb 1 and light bulb 2 will both be on

• Light bulb 1 will be off, but light bulb 2 will be on

• Light bulb 1 and light bulb 2 will both be off

• Light bulb 1 will be on, but light bulb 2 will be off

This image represents what type of circuit?

• open
• closed
• series
• parallel