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Solar Energy Review

Solar Energy Review. Vocabulary and Content. Vocabulary. Shadow Orientation Compass Sun Direction Thermometer Elapsed time Earth material Energy transfer Heat sink Solar energy Absorb Reflect Solar collector Surface area. How is a shadow created?.

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Solar Energy Review

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  1. Solar Energy Review Vocabulary and Content

  2. Vocabulary • Shadow • Orientation • Compass • Sun • Direction • Thermometer • Elapsed time • Earth material • Energy transfer • Heat sink • Solar energy • Absorb • Reflect • Solar collector • Surface area

  3. How is a shadow created? Opaque objects, like bodies, block light from the Sun, creating a shadow on the opposite side of the object.

  4. How does a compass work? • The compass needle always points to magnetic north.

  5. Why do the position and length of a shadow change throughout the day? • The shape and orientation of shadows change as the day progresses. The orientation and shape of outdoor shadows change because the position of the Sun changes continuously. The Earth rotates around the Sun, which makes the Sun at a different position in the sky at different times of the day. The Sun rises in the east and sets in the west.

  6. Explain how a thermometer works. • A thermometer is a thin glass tube filled with colored alcohol. As the alcohol warms, it expands and travels up the tube. When the alcohol cools, it contracts and goes back down the tube. To use the thermometer, you put the bulb in the material to be measured for temperature.

  7. Describe earth materials that heat up quickly. • Earth materials that heat up quickly are those that are dry. Dark colored ones will heat up more than light colored ones.

  8. Tell why water absorbs heat quickly, but it cools down slowly. • Water is a heat sink. It can absorb a large amount of heat for its volume and release energy slowly.

  9. Describe why the solar water heaters with black plastic in them heated up faster than those with white plastic in them. • Black plastic absorbs solar energy, which it transfers to the water.

  10. Describe why solar water heaters with lids heat up more than those without lids. • A cover keeps the heat inside the container. It also prevents energy transfer by keeping the water from coming in contact with cooler air around it.

  11. How was your solar house able to cook your s’mores? • The house absorbed the heat with the solar collector (black paper) in the bottom. It trapped the heat inside. The heat energy was transferred to your food, which heated it to make your s’mores.

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