Hydroelectric dams work by blocking the path of a water source to create an area with water held back by the dam. The dam can then be opened to allow water to be released.. The energy from the moving water is used and transformed into electrical energy. What type of energy does a hydroelectric dam capture as the water passes through?(1 point)
Responses
A. Sound energy
B. Light energy
C. Mechanical energy
D. Nuclear energy
C. Mechanical energy
The picture shows solar panels that power all appliances in this house.
An oven is being used to bake cookies in this house. What energy transformations occur when baking cookies in this house?
A. heat energy → light energy → chemical energy
B. heat energy → electrical energy → chemical energy
C. light energy → electrical energy → heat energy
D. heat energy → chemical energy → light energy
The total amount of energy in the universe never changes, but the availability of each different type of energy to do work can change tremendously. What best explains this change in available energy?(1 point)
Responses
A. Energy is always converted with 100 percent efficiency.
B. Energy is regularly changing from one form into another.
C. Energy can only be transferred as heat.
D. Energy can only be created through nuclear reactions.
B. Energy is regularly changing from one form into another.
What is the energy transformation that occurs when a smoke alarm goes off?(1 point)
Responses
A. electrical to potential
B. sound to light
C. potential to electrical
D. electrical to sound
D. electrical to sound
You are cooking pasta and putting a pot of water on an electric stove. When the water starts to boil, you add the pasta. What energy transformation occurs to cook the pasta?(1 point)
Responses
A. mechanical energy to light energy
B. heat energy to mechanical energy
C. electric energy to heat energy
D. nuclear energy to heat energy