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Energia y Luz: Taller de Ciencias

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Ejercicios de energía y circuitos

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Energia y Luz: Taller de Ciencias
 

Energia y Luz: Taller de CienciasOnline version

Ejercicios de energía y circuitos

by dain
1

Página 1

Potential energy is stored, kinetic is motion, sound is vibration, and heat is temperature.

  1. According to the picture, when you are kicking a ball. What is the useful energy transfer?
  2. a. Movement energy.
  3. b. Sound energy.
  4. c. Stored energy.
  5. d. Heat energy.

2. Potential energy is stored energy waiting to be used. Which of the following is an example of potential energy?

  • a.
  • b.
  • c.
  • d.

3. You cannot see through opaque objects at all. Why is the wall in the image considered an opaque material?

  1. a. Because the wall allows some light to pass through, but some light bounces off.
  2. b. Because the wall doesn’t allow any light to pass through.
  3. c. Because the wall reflects all the light.
  4. d. Because the light doesn’t reflect well.

4. When light moves from one medium (like air) to another medium (like water) it will change directions; this effect is called refraction. What is an example of refraction?

  1. a.
  2. b.
  3. c.
  4. d.
2

Página 2

5. The detective has a suit that charges energy from the sun, this helps him gain more strength and agility. The detective wears the black suit because:

  1. a. The black color helps him to break the energy of the light.
  2. b. The black color helps him to absorb the energy of the light.
  3. c. The black color helps him to erase the energy of the light.
  4. d. The black color helps him to repeal the energy of the light.

6. Reflection of light is the process where light waves bounce off a surface and change direction. When light hits a surface, it can be reflected. Why can you see your reflection in a mirror?

  1. a. Because the mirror refracts the light.
  2. b. Because the mirror reflects the light.
  3. c. Because the mirror allows all light to pass through.
  4. d. Because the mirror produces light.

7. Energy is necessary for anything to happen; it exists all around us and in many different forms. In the following image, what forms of energy do they represent?

  • a. Heat energy and potential energy.
  • b. Sound energy and light energy.
  • c. Potential energy and kinetic energy.
  • d. Chemical energy and kinetic energy.

8. Transparent objects let all the light pass, so you see clearly. Translucent objects let some light pass, but they look blurry. Opaque objects do not let light pass, so you cannot see through. According to the picture, which object lets all the light pass through?

  1. a. Shiny objects.
  2. b. Transparent objects.
  3. c. Translucent objects.
  4. d. Opaque objects.
3

Página 3

9. A conductor of electricity refers to a material that allows electric current to flow through a circuit. Which of the following is a conductor of electricity?

  1. a.
  2. b.
  3. c.
  4. d.

10. A closed circuit is like a complete path that electricity can follow. An open circuit is like a broken path that is interrupted, so electricity cannot flow. According to the image, What happens when the switch is closed?

  1. a. Electricity can flow.
  2. b. Particles stop moving.
  3. c. The light turns off.
  4. d. Appliances do not work.

11. Look at the pictures below and answer this question: How will the temperature of the objects in the images change?

  1. a. The white part will have a higher temperature than the black part.
  2. b. The black part will have a higher temperature than the white part.
  3. c. The black part will lose heat and the white part will gain heat.
  4. d. The two parts will have exactly the same temperature.
4

Página 4

12- Match the type of object with its description:

13- Complete the sentences using the following words. (battery, wires, bulb, switch, closed circuit, open circuit)

  1. a. A __battery __ provides electrical energy to the circuit.
  2. b. _Wires ___ connect the different parts of a circuit.
  3. c. A __bulb ___ produces light when electricity flows through it.
  4. d. A ___switch __ opens or closes the circuit.
  5. e. In a __closed circuit _, electric current can flow and the bulb can turn on.
  6. f. In an __open circuit __, electric current cannot flow and the bulb stays off.

14. Heat energy makes things warm, chemical energy is stored in food, movement energy is motion, and stored energy is waiting to be used. Sound energy lets us hear, and light energy helps us see. The first image shows food in a fridge. What type of energy does food transform chemical energy into?

  1. a. Light and potential energy.
  2. b. Chemical and electrical energy.
  3. c. Sound and light energy.
  4. d. Heat and movement.
5

Página 5

15. Look at the following chart and choose the correct answers about energy.

ALight bulbs change electrical energy into light energy.
BHeat moves from hot things to cold things.
CWindows and tables are sound energy.
DChemical energy like food or batteries are stored energy.
  1. a. A and B only.
  2. b. A, B and D.
  3. c. C and D only.
  4. d. B, C and D.

Read the situation and answer points 16 and 17

Daniel wants the small alarm to make a sound for his classroom project. He uses a battery, wires, a buzzer, and a switch. He connects the materials, but the buzzer does not make a sound. Daniel checks the circuit and notices that the switch is open. He needs to close the switch to complete the circuit.

16. What does Daniel need to do to complete the circuit?

  1. a. Open the switch.
  2. b. Close the switch.
  3. c. Remove the battery.
  4. d. Disconnect a wire.

17- What happens when the circuit is closed?

  1. a. The electric current can flow.
  2. b. The electric current stops.
  3. c. The battery disappears.
  4. d. The wires disconnect.

18. Complete the sentences using the words: (useful energy, wasted energy, sound energy)

  • - A washing machine uses energy to clean clothes. This is an example of __useful__ energy.
  • - A car engine produces extra heat that is not needed. This is an example of ___Wasted __ energy.
  • - A bell produces __Sound __ when it rings.
6

Página 6

19. Compare the electrical circuits and choose the true sentences.

circuits

20. Compare the electrical circuits and choose the true sentences.

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