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Eberhard Sci. Ch. 6
Eberhard Science Ch. 6 Light and Electricity
| Question | Answer |
|---|---|
| What does intensity of light refer to? | the amount of light being seen |
| How is the intensity of light related to distance? | The closer to the source of the light, the more intense the light will be. |
| What are two ways you can see an object? | It has to be a source of light or reflect light. |
| Name several sources of light. | sun, fire, flashlights, bio luminescent organisms |
| How does light travel from a light source? | in straight lines |
| What is reflection? | light bouncing off an object |
| How do we see the color of an object? | We see the color that is reflected off an object; all other colors are absorbed. |
| What is refraction? | When light passes from one type of transparent material to another and changes direction |
| Why does a straw in a glass of water look bent? | Light refracts as it travels through the water, distorting the appearance of the straw. |
| What is absorption? | the soaking in of light rays |
| What does light do to a transparent material? | Light passes completely through a transparent material, causing no shadow |
| Give several examples of transparent materials. | glass, air, water |
| What does light do to a translucent material? | The material scatters or absorbs some of the light, allowing some of the light to pass through it; objects appear blurry; faint shadows are produced |
| Give several examples of translucent materials. | waxed paper, frosted glass |
| What does light do to an opaque material? | Light cannot pass through at all, light is either reflected or absorbed; this object makes a dark shadow. |
| Give several examples of opaque materials. | wood, metals, thick paper |
| What is light, or white light, made up of? | all the colors of light mixed together |
| What is a prism? | a clear triangular piece of plastic or glass that refracts light into the colors of the spectrum |
| What are the colors of the spectrum? | red, orange, yellow, green, blue, violet (Roy G. BV) |
| What does each color in the spectrum represent? | a different amount of energy |
| What is a conductor? | a material that allows electric current to flow through it easily |
| How can you tell if a material added to an electric circuit is a conductor? | If the light stays on, it is a conductor. |
| What materials make good conductors? | metals, water |
| What is an insulator? | a material that does not allow electric current to flow through it easily |
| What materials make good insulators? | plastics, glass and wooden materials |
| What is a complete circuit? | a closed path through which electricity flows |
| What does a wire do in an electric circuit? | conducts the electric current |
| What does a switch do in an electric circuit? | If closed, it completes the circuit and allows current to flow through. If open, it stops the current. |
| What does a battery do in an electric circuit? | It pushes the electric current around the circuit. |
| What does a light bulb do in an electric circuit? | It changes electrical energy into light energy. |
| What is a series circuit? | a circuit with one path and more than one devices such as light bulbs |
| In a series circuit, what happens if one light bulb goes out? | all the other light bulbs in a circuit go out too |
| What is a parallel circuit? | a circuit with more than one path |
| In a parallel circuit, what happens if one light bulb goes out? | the other light bulbs stay on if they are on different paths |
| Give examples of devices that change electrical energy into light energy. | light bulbs in lamps, televisions, and computer monitors. |
| Give examples of devices that change electrical energy into heat energy. | stoves, toasters, ovens |
| Give examples of devices that change electrical energy into sound energy. | radios, televisions |
Created by:
betheb
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