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Circuits, Magnets and Light Test

Circuits, Magnets and Light Test. Study Guide Answers. A region around a charged object where electric force is present. Electric Field. An electromagnetic wave is special because. It can travel through empty space and matter. Current is expressed in. Amperes (Amps).

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Circuits, Magnets and Light Test

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  1. Circuits, Magnets and Light Test Study Guide Answers

  2. A region around a charged object where electric force is present. Electric Field

  3. An electromagnetic wave is special because It can travel through empty space and matter.

  4. Current is expressed in Amperes (Amps)

  5. How are electromagnetic waves produced? By alternating electric and magnetic waves.

  6. How is the electromagnetic spectrum divided? By Wavelength

  7. Resistance is expressed in Ohms

  8. The major source for energy on Earth is the Sun

  9. The tiny particles that make up matter. atoms

  10. Voltage is expressed in Volts

  11. What are the three basic parts of a circuit? Energy source, load and wires.

  12. What are the three properties of magnets? North/south pole, magnetic force, magnetic field

  13. What is nearsightedness? When a person can see objects up close but they look blurry far away.

  14. What is the current type and voltage used in the United States? 120V Alternating Current

  15. What is the difference between alternating current and direct current? (AC vs. DC) Alternating current can go in both directions whereas direct current can only go in one direction.

  16. What is absorption? When an object absorbs light waves.

  17. What is an aurora? When Sun’s light particles get trapped in the magnetosphere and enter Earth’s atmosphere and react with Nitrogen and Oxygen.

  18. What is an electrode? Where charges enter or exit a cell.

  19. What is diffraction? The bending of light around a hole or opening.

  20. What is reflection? When something bounces off of an object at the sample angle that it entered at.

  21. What is refraction? The bending of light when light enters into a new substance.

  22. What is scattering? When a wave bounces off an object in multiple directions.

  23. What is the difference between a conductor and an insulator. A conductor allows electricity to pass through it easily like metal. An insulator does not allow an object to pass electricity easily like wood.

  24. What is the difference between a parallel and series circuit? A parallel circuit can go in numerous paths and the current is the same at all points. A series circuit can only go one path and the current is not the same at all points.

  25. What is the difference between color addition and color subtraction. Color addition is the adding of colors of light. (all colors make white light) Color subtraction is the combining of pigments. (all colors combine to make black)

  26. What is the difference between constructive and destructive interference. Constructive interference is when two waves combine to make a wave with a greater amplitude. Destructive interference is when two waves combine to make a wave with a smaller amplitude.

  27. What is the difference between geographic and magnetic North? Earth’s magnetic poles are the points on Earth’s surface where its magnetic forces are the strongest. Geographic North is the top most part of Earth.

  28. What is the difference between induction and conduction? Induction is the transfer of electric charges by being close to an object. (no contact) Conduction is the transfer of electric charges by direct contact.

  29. What is the electromagnetic spectrum? The entire range of electromagnetic waves.

  30. What is the formula for Power? P = E x t

  31. What is the speed of light? 300,000,000 m/s

  32. When a switch is ____, charges flow freely allowing the lights to be on. Closed

  33. When does scattering occur? Off of any no smooth surface or particle in the air.

  34. When resistance changes what happens to current? If resistance increases, current decreases If resistance decreases, current increases

  35. When voltage changes what happens to current? If voltage increases, current increases. If voltage decreases, current decreases.

  36. Where does a compass point? Magnetic North

  37. A object that is transparent, translucent or opaque is determined by it’s ability to Transmit Light

  38. Why do we see the moon? It reflects the Sun’s light

  39. What is the difference between conduction and convection? Convection occurs in air and conduction occurs when two objects are in contact.

  40. Where does all the energy originally come from? The Sun

  41. The End Test is Wednesday 3/28/2012

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