Electric Circuits

Erik built a circuit. His light bulb did not light up. Which of these could NOT be the cause?

• Open switch

• dead battery

• closed circuit

• loose connection

Rebecca makes a circuit with a battery, wires, and a light bulb. What is the function of the light bulb?

• It opens or closes the circuit.

• It provides electrical energy to the battery.

• It changes electrical energy to light energy.

• It increases the strength of the electricity.

Lisa turned off a switch. What does turning off a switch do?

• Open a circuit, stopping electricity from flowing.

• Close a circuit, allowing electricity to flow.

• Open a circuit, allowing electricity to flow.

• Close a circuit, stopping

  electricity from flowing.

The following instructions explain how to make a circuit that will power a buzzer:

1.Connect a wire from the positive pole of the

battery to the switch.

2. Connect a wire from the switch to the buzzer.

3. ?

4. Close the switch.

What is the missing step in #3?

• Connect a wire from the buzzer to the positive pole of the battery.

• Connect a wire from the switch to the negative pole of the battery.

• Connect a wire from the buzzer to the negative pole of the battery

• Connect a wire from the positive pole to the negative pole of the battery.

Mei does not have any wire to connect a battery and the bell. Which of the following materials can she use to make a connector?

• Newspaper

• Plastic Wrap

• Wax paper

• Aluminum foil

Debora has a young sister. Her parents put covers on the electrical outlets so that her sister will not accidentally get a shock. What material were the covers most

likely made of?

• aluminum

• copper

• plastic

• steel

An electrician stripped (took off) the plastic off the end of this wire. Why did he do this?

• because the plastic is too difficult to connect to other parts of the circuit

• so the metal can be used to make a connection to create a circuit

• because electricity can’t flow through wires surrounded by plastic

• so the wires can be used to resist an electric current

Anthony is classifying some objects as conductors or insulators. What is the difference between conductors and insulators?

• A conductor allows electrical current to flow through it easily, while an insulator does not.

• An insulator allows electrical current to move through it easily, while a

  conductor does not.

• A conductor has a static charge, while an insulator does not.

• An insulator is a metal, while a conductor is not a metal.

Which will light a bulb?

• A battery and a paper clip
• A battery and a wire
• A paper clip and a wire
• A switch and a wire

Where does electricity enter and exit the bulb?

• 1 and 2
• 2 and 3
• 3 and 4
• 4 and 1