18. What Energy Transformation Is Happening When You Plug In…
18. What energy transformation is happening when you plug in the radio to the electrical outlet and the music
starts to play?
A. Electrical energy to sound energy
B. Sound energy to electrical energy
C. Sound energy to electrical energy to sound energy
D. Electrical energy to sound energy to electrical energy
19. Which of the following examples shows how electrical energy is transformed to sound energy?
A. Plug in the speaker to the outlet and turn it on.
B. Plug in the oven to the electrical outlet and turn it on.
C. Plug in the wall fan to the electrical outlet and turn it on.
D. Plug in the ring light to the electrical outlet and turn it on.
20.By conserving electrical energy, our electric bill will be lower. What advice will help us save electrical
energy?
A.Leave the TV on.
C.Use air conditioning every day.
B.Turn on the lights day and night.
D. Unplugged appliances not in use.
21. Which pattern best describes the energy change when light bulb is plugged into a socket?
A. electrical – light
heat
C.electrical heat
B.chemical -heat electrical
mechanical
D. heat electrical
light
Answer:
18. A
19. A
20. D
21. B
Explanation:
hope it helps
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