Electrical Energy Transformation Review

A circuit diagram uses symbols to represent each part of the circuit. Look at the circuit diagram and the key shown here.

What is the purpose of the wire in the circuit?

• to use the electric current

• to connect the components

• to provide a source of electrical energy

• to change the circuit from open to closed

Look at the four ways that you could connect a battery, a paper clip, a light bulb, and some wire.

Which one of these would light the bulb?

• 
• 
• 
• 

Tags

NGSS.4-PS3-2

Study the circuit below. When the switch is closed, all three light bulbs are lit.

What will happen if Bulb A burns out?

• Bulbs B & C will continue to shine

• Bulbs B & C will stop shining

• Bulbs B & C will shine more brightly

• Bulbs B & C will shine less brightly

Gary built the circuit shown here.

What happened when Gary closed the switch?

• The bulb lit, and the buzzer sounded at the same time.

• Nothing happened because light bulbs and buzzers must be in different circuits.

• Nothing happened because there was no source of electrical energy in the circuit.

• Nothing happened because the circuit needed to have two switches.

Jay uses various objects to complete a circuit. He compares how bright a bulb glows using each object. His results are shown here.

Which object is the BEST electrical conductor?

• nail

• eraser

• crayon

• pencil lead

Which of the following will cause electric charges to no longer flow through a circuit?

• A wire is replaced with a conductor.

• A switch is flipped, causing the circuit to become closed.

• The circuit is changed so that the wires do not make a complete loop.

• The wires are changed so that a series circuit becomes a parallel circuit.

The plastic coating was removed from the end of the wire shown here.

What is the purpose of the plastic coating?

• to carry electric current in a circuit

• to make the wire more flexible

• to insulate people or objects from the electric current in the wire

• to make it easier to tell when the wire is carrying electric current

The circuit in this picture has a battery, a light bulb, and three switches. All of the switches are open, and the light bulb is off.

Which of these combination of switches could be closed and cause the light bulb to remain off?

• X and Y

• Y and Z

• X and Z

• X, Y,, and Z

Study the materials in this table.

Which are placed in the wrong column?

• air, copper, and glass

• iron, glass, and rubber

• bronze, glass, and iron

• silver, bronze, and glass

Tags

NGSS.MS-PS2-3

A doorbell circuit includes a source of current, a bell, a button that switches the current on and off, and wires.

What energy transformation occurs when the doorbell rings?

• electrical energy into light energy

• electrical energy into sound energy

• chemical energy into light energy

• mechanical energy into electrical energy