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
Mechanical energy
Mechanical energy
Nuclear energy
Nuclear energy
Sound energy
Sound energy
Light energy
I think the answer is mechanical energy
You are correct, the type of energy that a hydroelectric dam captures as the water passes through is 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?
(1 point)
Responses
heat energy → electrical energy → chemical energy
heat energy → electrical energy → chemical energy
heat energy → light energy → chemical energy
heat energy → light energy → chemical energy
light energy → electrical energy → heat energy
light energy → electrical energy → heat energy
heat energy → chemical energy → light energy
I think the answer is c
Actually, the correct answer is a. When baking cookies in this house, the energy transformations that occur are heat energy first, which is produced by the oven, then electrical energy is used to power the oven, and finally, chemical energy is transformed within the cookies as they are baked.
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
Energy is regularly changing from one form into another.
Energy is regularly changing from one form into another.
Energy is always converted with 100 percent efficiency.
Energy is always converted with 100 percent efficiency.
Energy can only be transferred as heat.
Energy can only be transferred as heat.
Energy can only be created through nuclear reactions.
I think the answer is a
You are correct. The explanation for the change in available energy is that 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
potential to electrical
potential to electrical
sound to light
sound to light
electrical to sound
electrical to sound
electrical to potential
I think the answer is c
You are correct. The energy transformation that occurs when a smoke alarm goes off is 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
heat energy to mechanical energy
heat energy to mechanical energy
electric energy to heat energy
electric energy to heat energy
nuclear energy to heat energy
nuclear energy to heat energy
mechanical energy to light energy
I think the answer is b