Forms of Energy Transformations in Electric Circuits

Electric companies send electric power through an electric power grid to your home. The illustration below shows some of the parts of an electric power grid.

At which part of this grid is electrical energy produced from other forms of energy?

• substation

• distribution line

• transmission lines

• generating station

A vacuum cleaner uses a type of energy that comes from the movement of electrons. Which type of energy is it?

• chemical

• electrical

• mechanical

• thermal

How do we control electric charges so that we can use electricity?

• collect protons from atoms

• make electrons flow through a wire

• run static electricity through a battery

• use lightning rods to ground lightning bolts

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Why are metals classified as conductors of electrical energy?

• metal conducts heat

• metals do not melt easily

• Nonmetals do not conduct an electric current

• Metal contains electrons that can easily move through it

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Many appliances use electrical energy. Which of these appliances is intended to convert electrical energy into sound energy?

• printer

• refrigerator

• electric heater

• music amplifier

Which is an effective way to implement a simple experimental investigation to test the idea that electricity travels only through a closed circuit?

• Switch on the electrical circuits of appliances in your classroom

• Build and use an electrical circuit with a switch to open and close it

• Draw a diagram of a circuit that has a switch to open and close it

• Observe and collect information about electrical circuits.

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If you were building a circuit, why would you use copper and not rubber to send electricity through the circuit?

• Copper is a better insulator.

• Rubber is a better conductor.

• Copper is an insulator, but rubber is a conductor.

• Copper is a conductor, but rubber is an insulator.

Suppose you built an electric circuit that included a light bulb. Which would be empirical evidence to support the analysis that the circuit was complete?

• The bulb would produce light and heat.

• The bulb would not produce light or heat.

• The bulb would produce light but not heat.

• The bulb would produce heat but not light.

You use energy transformations every day. Which of these is a way that you would use the transformation of electrical energy into motion energy?

• watching your favorite show on television

• taking an elevator to the top of a tall building

• listening to your MP3 player while you walk to school

• turning on the lamp on your desk so you can see to do your homework

The girl shown below is using a common electrical appliance.

The intended use of this appliance demonstrates that an electric current can produce which of the following?

• light and chemical energy

• heat and kinetic energy

• heat and radiant energy

• sound and potential energy

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