Electricity Review

Sidney wants to make an electric circuit. She gathers the items shown.

What additional item does Sidney need to make a complete circuit?

• a battery

• a switch

• an insulator

• a conductor

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Roberto makes an electric circuit that has a switch as one of its parts. The diagram below shows the circuit that he makes.

Which claim describes what would happen to the light bulb if Roberto changes the switch from closed to open?

• It would be duller.

• It would be brighter.

• It would stop glowing.

• It would start glowing.

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Sara arranges the parts of a circuit as shown below.

Where should Sara put a piece of wire in order to complete the circuit?

• between the top of the battery and the top of the paper clip

• between the top of the battery and the bottom of the light bulb

• between the top of the paper clip and the bottom of the battery

• between the top of the paper clip and the bottom of the light bulb

Philippe needs to choose an item to use to complete a circuit he is making. Which item would you claim would be his best choice?

• metal coin

• glass bead

• plastic straw

• wooden toothpick

Liam wants to determine if foam is a good insulator. He decides to connect wires to two ends of a battery and then connect one wire to each end of a foam cup. Which inquiry skill is Liam using?

• predict

• hypothesize

• use models

• plan and conduct an investigation

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The plastic coating was stripped off the end of the piece of wire shown below.

Why must the plastic be removed before this wire is used in an electric circuit?

• so the wire can be bent and fit into the circuit

• to prevent the circuit from becoming overloaded

• because the plastic makes the wire too thick to use in a circuit

• so that electric current can pass between the copper wire and other parts of the circuit

Erica looked at a group of objects and classified them as electrical conductors or insulators. She made the table below to show her results.

How many objects are not classified correctly?

• 0

• 1

• 2

• 4

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Some materials do not conduct electric current. Which of these materials is an electrical insulator?

• CD case

• paperclip

• penny

• staple

Ariel wants to build an electric circuit with a device that can be turned on and off. Which list contains all of the materials she needs for her circuit?

• wire, ruler, switch, battery

• string, buzzer, battery, switch

• buzzer, wire, switch, light bulb

• battery, wire, light bulb, switch

In a lightbulb, such as the one shown, the filament glows brightly when the switch is turned on.

What energy transformation occurs at the filament of the bulb?

• chemical energy into light energy

• light energy into to electrical energy

• potential energy into thermal energy and light energy

• electrical energy into thermal energy and light energy

Tags

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