Unit 2.2 Electrical Circuits

If Jenna is trying to complete the circuit in the picture, which item should she attach the alligator clips to in order to create a complete circuit?

• string

• paper

• piece of wood

• piece of foil

Tags

NGSS.MS-ETS1-1

Sue could not figure out why her circuit would not work. Look at her circuit.

Can you help her figure out the problem? Which part of the circuit is not complete

• Point A

• Point B

• Point C

• Point D

Tags

NGSS.MS-ETS1-1

Mary is preparing an experiment to test how well unknown materials conduct electricity. She will use two probes to touch each object. First she wants to be sure the probes are working properly. Which of the following materials should Mary choose to test the probes.

• a copper penny

• a rubber ball

• a plastic bottle

• a piece of wood

Tags

NGSS.MS-PS2-3

Electrical wires have a coating because...

• Plastic is an insulator and will help to protect someone who touches the wire from getting a shock

• plastic is a good conductor, so the electricity will flow faster through the wire

• the plastic keeps the wires hot enough to conduct electricity

• the plastic cools the wires so that they do not melt when electricity flows through them.

Tags

NGSS.MS-PS1-3

Which statement best defines an electrical circuit

• a closed path of conduction in which electrons can flow

• a closed path of conduction in which protons can flow

• a closed path of conduction in which neutrons can flow

• a closed path of conduction in which leptons can flow

A teacher has 4 beakers labeled A through D. Each beaker holds 150ml of water mixed with 5 grams of a different substance. The substances are sugar, flour, salt and sand.

The teacher has built a circuit like the one in the diagram. After plugging the adapter in the wall socket, the teacher dips the probe on the end of the cable into each beaker. The bulb produces the brightest light when the cable is inserted in the beaker of saltwater.

Which explanation supports the results of the experiment the best.

• saltwater is a better conductor than the other mixtures.

• saltwater eats away the metal threads inside the light bulb

• Salt dissolves more easily in water than sugar, flour and sand do.

• Salt grains are the right size to conduct electricity

Tags

NGSS.MS-PS1-2

Michelle got a shock from touching a cord. What is the most likely problem with the cord?

• There is too much current

• There is not enough current

• The insulation is cracked

• There is too much insulation

Jane's circuit is not working.

What rule about CURRENT has she broken?

• A current is continuous

• A current is not continuous

• A current should not have many parts

• A current should not have too much power

Electrical wire is usually made of ______ because it is a good conductor of electricity.

• plastic

• silicone

• lead

• copper

Rafael has a circuit like the one shown in this diagram.

Which of the following items should Rafael add to the circuit to make the light shine?

• A switch to the right of the light

• a power source such as a battery

• A second wire from the light to the switch

• A light switch to the left of the switch

Tags

NGSS.3-5-ETS1-1

NGSS.3-5-ETS1-2

NGSS.4-PS3-2