Bell WOrk-Oct 21-5th grade

An incomplete circuit is shown.
To complete the circuit, a wire should be placed from —

• Point D to Point C
• Point B to Point C
• Point A to Point D
• Point B to Point D

This circuit has a battery, buzzer, and switch.
When the switch is closed the buzzer will sound because -

• the switch gives energy to the battery
• the buzzer is made of special plastic
• the wires are cooled by the surrounding air
• electricity can flow in a complete path

Choose the correct sentence.

• This circuit will work because it is an open circuit.
• This circuit will work because it is a closed circuit.
• This circuit will NOT work because it is an open circuit.
• This circuit will NOT work because it is a closed circuit.

Which bulbs will light?

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

Which of these best completes the circuit?

• rubber band
• metal nail
• leather shoelace
• wooden toothpick

A fifth grade class constructed this circuit.  Which of these objects most likely made the light glow when connected to points X and Y?

• plastic straw
• cotton string
• copper penny

• rubber eraser

Which of these substances conducts electricity the best?

• wood
• brick
• copper
• plastic

What material would be safest to use as an insulator to cover electrical wires?

• rubber
• tin
• aluminum
• water

The electrician in this picture is wearing rubber gloves for protection.  The purpose of the rubber gloves is to --

• keep the electrician dry
• create an electrical circuit
• produce electricity
• protect the electrician

If you replace the paper clip with a plastic spoon, what happens?

• The bulb doesn't light
• The bulb is dimmer
• The wires get hot
• There is no change