Energy Forms
What form of energy helps you see objects?
Light Energy
A light bulb gives off which form of energy that lets you see?
Light Energy
What must be true for a bulb in a simple circuit to light?
The circuit must be complete(closed).
What is it called when light bounces off a surface?
Reflection
A student closes a switch in a complete circuit. What happens to the bulb?
The bulb lights up.
What form of energy is present when a bell rings?
Sound Energy
A buzzer changes electrical energy mainly into what kind of energy you can hear?
Sound Energy
What does an open switch do to a circuit?
It creates a gap and breaks the path.
Which surface usually reflects light more clearly: a smooth mirror or rough fabric?
A smooth mirror
A student opens a switch in a circuit. What happens to the flow of electrical energy?
The circuit is broken, and the bulb turns off.
A soccer ball has what kind of energy after is has been kicked?
Mechanical Energy
What energy transformation happens in a battery-powered flashlight?
Chemical energy to electrical energy to light energy (and thermal energy).
A bulb is connected to a battery by wires in a complete loop. The switch is closed. Will the bulb light?
Yes
How does light from a toy reach your eyes when the toy does not make its own light?
Light reflects off of the toy and to your eyes
A flashlight is turned on. What energy transformation takes place?
Chemical energy → electrical energy → light energy.
A lamp become warm when it is on for a long period of time. What form of energy causes that?
Thermal Energy
A student uses a battery to power a buzzer. Name the energy change from the battery to the sound.
Chemical energy to electrical energy to sound energy.
A circuit has two branches. One branch is broken, but the other branch is complete. What happens to the bulb on the complete branch?
It can still light because the branch has a complete path.
What happens to light when it moves from one material into another and bends?
It refracts
Light hits a mirror and bounces away. What is this called?
Reflection
A battery provides energy to a flashlight. What type of energy is stored in the battery before it is used?
Chemical Energy
A toy car is powered by a battery and moves across the floor. What is one energy transformation in this system?
Chemical energy in the battery changes to electrical energy, then to mechanical energy as the car moves.
A bulb's path contains two switches. Both switches must be closed for the bulb to light. If one switch is open, what happens? Explain.
The bulb stays off because the open switch breaks its path.
You see a tree reflected on a pond. Explain how the light travels for you to see the tree's reflection.
Light reflects off of the tree, then reflects from the water and travels to your eyes
A student turns on a lamp to see a toy in a dark room. Explain how the student is able to see the toy.
Light from the lamp reflects off the toy and travels into the student's eyes.