Forms of Energy
What form of energy allows us to see things?
Light energy.
What is an energy conversion?
When energy changes from one form to another.
What is an energy source?
Something that provides energy.
You hear music coming from a speaker. What evidence tells you an energy conversion occurred?
Sound was produced.
You flip the switch on a lamp. What do you predict will happen?
The bulb will produce light.
What form of energy do you hear?
Sound energy.
A lamp changes electrical energy into what form of energy?
Light energy.
What provides the energy that allows a battery-powered toy to move?
The battery.
You plug in a fan and its blades begin spinning. What evidence shows that energy was converted?
The blades moved.
A battery is removed from a battery-powered toy. What will happen?
The toy will stop working/moving because its energy source was removed.
A moving bicycle has what type of energy?
Motion/kinetic energy.
A toaster changes electrical energy mainly into what form of energy?
Thermal/heat energy.
A solar panel receives energy from what source?
Sunlight/the Sun.
A blender is plugged in and begins spinning and making noise. Name two outputs of the energy conversion.
Motion energy and sound energy.
A fan is plugged in but switched off. Will its blades have motion energy? Explain.
No. The fan isn't converting electrical energy into motion while it is switched off.
A hot stove gives off what form of energy?
Thermal/heat energy.
A speaker uses electrical energy and produces what form of energy?
Sound energy.
What is the main source of energy for most life on Earth?
The Sun.
A lamp is switched on. Name the input and output energy.
Input: electrical energy; output: light energy.
A hair dryer produces moving air and heat. What two energy outputs can you identify?
Motion energy and thermal energy.
A stretched rubber band has stored energy. What happens to that stored energy when you release it?
It changes into motion energy.
A battery-powered flashlight involves multiple energy conversions. Describe the energy conversion from the battery to the flashlight's output.
Stored/chemical energy → electrical energy → light energy (and some heat).
A student says, “The light bulb is the energy source in a flashlight.” Explain why this is incorrect.
The battery is the energy source; the bulb converts electrical energy into light.
What type of energy cannot be an output?
Electrical energy
A student turns on a battery-powered toy car. The car moves, makes noise, and its small headlights turn on.
Identify the energy source and describe at least three energy outputs/conversions occurring in the system.