STAAR Review Circuits, Conductors, and Insulators

Electrical fuses are safety devices used in all types of electrical circuits, including houses and cars. Shown in the picture is a diagram of a working fuse and a blown fuse.

Which statement about a circuit containing a

blown fuse is correct?

• An electrical circuit with a blown fuse will still function properly.

• An electrical circuit with a blown fuse will not work because the broken wire prevents thermal current from flowing through the circuit.

• An electrical circuit with a blown fuse will not work because the broken wire prevents electrical current from flowing through the circuit.

• An electrical circuit with a blown fuse will not work because the broken wire prevents light current from flowing through the circuit.

 A light bulb changes electrical energy into

• light energy only
• heat and chemical energy
• light and heat energy
• light and chemical energy

What is a switch's function in a circuit?

• to make the current hotter or colder
• turn on and off the flow of current
• the pathway that current flows
• to add more power to the circuit

What kind of circuit is this?

• series
• parallel

What is one problem with using a series circuit? 

• It has a lot of series. 
• If one goes down, they all go down! 
• It doesn't work properly.
• There are no problems. 

A class prepared some electrical circuits using battery, connecting wires, and three light bulbs.  Which of these circuits can make the three bulbs light?

• A
• B
• C
• D

A group of students built the circuit shown above. The lightbulb does not glow. Which statement explains this observation?

• The battery is not charged

• The lightbulb is not part of a complete circuit

• The circuit does not have a switch

• The bell uses most of the energy from the battery

A simplified diagram of a system using solar energy is shown. To recharge the battery for later use without lighting the bulb, which of the following switches should be closed?

• switch S only

• switches R and S only

• switches R and T only

• switches R, S, and T

All the lightbulbs in this circuit are lit. Which change would cause all the bulbs to go out?

• Removing wire 1

• Removing wires 2 and 4

• Removing wires 2 and 5

• Removing wires 3 and 4

Students constructed a circuit using different-colored lightbulbs. What will happen if Switch 3 is closed and the other switches are left open?

• Only the white bulb will operate

• None of the bulbs will operate

• Only the white and yellow bulbs will operate

• Only the red and blue bulbs will operate