Forms of Energy
What type of energy is stored in food and fuels?
Chemical energy
What energy transformation occurs in a flashlight?
Chemical energy → Electrical energy → Light energy
What material is commonly used in electrical wires because it is a good conductor?
Copper
What happens when two objects have the same electric charge
They repel each other.
What household device transforms electrical energy into light energy?
A lamp
Which type of energy travels in waves and allows us to hear sounds?
Sound energy
What type of energy transformation happens in a battery-powered toy car?
Chemical energy → Electrical energy → Mechanical energy
What is the purpose of a switch in an electrical circuit?
It allows the circuit to be opened and closed easily.
Danny rubs two balloons against a thick carpet, and they gain a negative charge. What happens when he brings them close together?
They repel each other.
What energy transformation occurs in a television remote control?
Chemical energy in batteries → Electrical energy → Light energy (infrared signals)
Which type of energy is produced when objects move?
Mechanical energy
Which energy transformation allows a microwave to heat up food?
Electrical energy → Thermal energy
If a light bulb in a circuit does not turn on, what might be wrong?
The circuit is open or incomplete.
What natural phenomenon is caused by the buildup and release of static electricity?
Lightning
Engineers are designing a toy firetruck that runs on batteries. What energy transformation must take place?
Electrical energy → Mechanical energy (motion) and Sound energy (siren)
What form of energy do batteries store before transforming it into electrical energy?
A firecracker explodes in the sky. What two forms of energy are released?
Sound energy and light energy
Why do we cover electrical wires with rubber or plastic?
These materials are insulators and prevent electric shocks.
Why do your clothes sometimes stick together after being in the dryer?
Static electricity causes them to attract.
A clothes dryer transforms electrical energy into which two types of energy?
Thermal energy and Mechanical energy
What type of energy is responsible for the warmth from the sun?
Thermal energy and light energy
What energy transformation happens in a solar-powered calculator?
Light energy → Electrical energy → Mechanical energy
What happens when a circuit is open?
Electricity stops flowing, and devices turn off.
What happens when opposite charges meet?
They attract each other.
If a wind turbine is used to generate electricity, what energy transformation is occurring?
Mechanical energy (wind) → Electrical energy