Energy Transfer, Conductors & Insulators

The fan illustrated here plugs into the wall and blows air to make a room cool.

Which of the following best explains how it works?

• It reduces heat by producing sound energy.

• It gets chemical energy from gases in the air.

• It transforms electrical energy into the energy of motion.

• It spins, sending heat and light energy through its wires.

Maya’s teacher asked all the students to take a picture of electrical energy being transformed into light energy. Which picture will correctly meet the requirements of this assignment?

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Which of the following energy transformations occur when Suzy brushes her teeth with an electric toothbrush?

• Chemical to light

• Electrical to chemical

• Electrical to motion

• Chemical to electrical

Scott has spent the day at school. During the day, Scott uses several devices that use electricity. Which device is designed specifically to convert electrical energy to heat energy?

• Toaster

• Alarm clock

• Bicycle

• Calculator

A battery, bulb, wires, and a switch have been assembled, as shown in the illustration. The bulb does not light.

What change would make the bulb light?

• Use a larger battery

• Change the wires

• Close the switch

• Replace the bulb

Tags

NGSS.4-PS3-2

Which of these would be a good insulator of electricity?

• Steel

• Rubber

• Copper

• Aluminum

Electricity can flow only when which of the following is present?

• A switch attaches to a battery.

• The circuit has a lightbulb.

• There is a complete path for it to follow.

• The wire is made from an insulator.

Kimberly is building a model of an electric circuit and must choose an object that conducts electricity well. An image of four objects is provided.

Which of these would be the best conductor of electricity that Kimberly could choose?

• Plastic bottle

• Aluminum can

• Wooden block

• Glass marble