Electrical Circuits

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? (5.6B)

• 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? (5.6B)

• 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? (5.6B)

• 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.

This circuit has three lightbulbs and a bell. Which procedure will result in only the blue lightbulbs operating? (5.6B)

• Close Switches 1 and 2 and leave Switch 3 open

• Close Switch 3 and leave Switches 1 and 2 open

• Close Switches 2 and 3 and leave Switch 1 open

• Close Switch 2 and leave Switches 1 and 3 open

The diagram shows an electric circuit with four bells that a student plans to build. When the student connects the wires as shown, which of the bells will ring? (5.6B)

• Bell 1 only

• Bells 1 and 4 only

• Bells 3 and 4 only

• Bells 1, 2, 3, and 4

This circuit has five light-emitting diode, or LED, lights. It also has one battery and one switch. Which LEDs produce light when the switch is in the position shown? (5.6B)

• LEDs 1, 3, and 4 only

• LEDs 1, 2, 3, and 4

• LEDs 3 and 4 only

• LEDs 1, 3, 4, and 5

The circuit shown does not work. Which procedure would most likely allow the bulbs to light? (5.6B)

• Open the switch and then connect the two wires that are attached to the wood block

• Switch the positions of the two wires that are connected to the battery and the open the switch

• Move the switch closer in the circuit to the battery

• Connect the two wires that are attached to the wood block

Students investigate the flow of electricity in circuits. The teacher instructs them to wear rubber gloves during the investigation because — 5.1(A)

• rubber gloves are insulators

• rubber gloves are conductors

• rubber gloves keep the students dry

• rubber gloves allow electricity to flow

The diagram shows the metal posts that are usually found on a battery. The battery can be connected to a bell and a switch to produce sound. Which statement best explains why there are two metal posts on the battery? (5.6B)

• The battery needs only one metal post to connect to the bell, but the other metal post is present in case the first post fails to work.

• The battery needs to form a complete circuit that starts with one metal post and ends with the other metal post.

• One metal post makes a complete circuit with the switch, and the other metal post makes a complete circuit with the bell.

• One metal post makes the bell start to ring, and the other metal post makes the bell ring louder.