Electric Circuits

Which statements describe a closed circuit? Check all that apply.

• Bulbs will shine.

• Bulbs will not shine.

• The circuit is incomplete.

• The circuit is complete.

• Charges flow.

In a movie, a character cuts a wire, which stops the countdown timer of a bomb. What does cutting the wire do the circuit?

• It opens the circuit so that the electric charges do not flow to the timer.

• It closes the circuit so that electric charges do not flow to the timer.

• It opens the circuit so that electric charges flow to the timer.

• It closes the circuit so that electric charges flow to the timer.

When an electric circuit operates, a buzzer makes a sound. What happens to the electric charges in this circuit?

• The electric charges move from the energy source and are used up at the switch.

• The electric charges move from the energy source and are used up at the buzzer.

• The electric charges move from the buzzer through the energy source and back to the buzzer.

• The electric charges move from the energy source through the buzzer and back to the energy source.

Chang wants to build a circuit that will light up the bulb from a flashlight. Which component could Chang leave out and still light up the bulb?

• the switch

• the battery

• the wire

• the light bulb

Roshan describes the basic parts of an electric circuit using a shower as a model. Which part of a circuit does the water pipe represent?

• the wire

• the switch

• the battery

• the resistor

Which device manages the flow of current in an electric circuit?

• the wire

• the switch

• the battery

• the light bulb

Jamal draws the circuit diagram shown.

How many of each component are shown in the diagram? Check all that apply.

• one battery

• two switches

• two batteries

• two resistors

• three light bulbs

A large cooler is filled with water, as shown below.

How does the valve on the cooler compare with the switch in an electric circuit?

• Opening the valve allows water to flow, just like opening a switch allows charges to flow.

• Opening the valve stops the flow of water, but closing a switch stops the flow of charges.

• Closing the valve stops the flow of water, but opening a switch stops the flow of charges.

• Closing the valve allows water to flow, just like closing a switch allows charges to flow.

What symbol would best represent an electric fan in an electric circuit?

• 
• 
• 
• 

Patty makes a table of the symbols used for the parts of an electric circuit.

What label should Patty place in the marked cell?

• battery

• switch

• resistor

• bulb