Energy Transformations

"Energy can be transformed from one form into another or transformed from one region or another, but energy cannot be created or destroyed."

Which law is this?

• Law of Conservation of Mass

• Newton's Second Law

• Law of Conservation of Energy

• Law of Conservation of Momentum

Which of the following energy transformations occur when a lamp that is plugged into a wall socket is functioning correctly?

• Chemical to light
• Electrical to chemical
• Electrical to light
• Chemical to electrical

The picture shows a microwave oven. As a microwave oven is operated, electrical energy is transformed into all of the following types of energy EXCEPT —

• nuclear

• light

• thermal (heat)

• kinetic

What energy is given off when a cell phone rings?

• Sound Energy

• Gravitational Energy

• Thermal Energy

• Potential Energy

Which of the following shows the correct order of the energy transformations that occur when green plants produce their food from the Sun’s energy?

• chemical → thermal

• light → chemical

• thermal → light

• chemical → electrical

People get energy from the food that they eat and transform that energy as they move. Which energy transformations occur as a student rapidly rubs the palms of his hands together?

• mechanical to thermal to electrical

• chemical to kinetic to heat

• mechanical to chemical to sound

• chemical to sound to electrical

A computer works by transforming electrical energy into what other kinds of energy?

• Light, heat, kinetic energy, and sound

• Thermal, chemical, and potential

• Sound, kinetic, and electrical

• Light, chemical, and potential

A car transforms the __________energy from the gasoline to __________energy of motion.

• heat; electrical

• nuclear; kinetic

• kinetic; potential

• chemical; kinetic

Some students observing a classroom device being used, noticed the below energy transformations.

Electrical →kinetic → Sound

Which device were the students most likely observing?

• A triple beam balance measuring an object’s mass.

• A pencil sharpener plugged into a wall outlet.

• A projector displaying a diagram on the screen.

• A working flashlight used to light up a dark corner.

What kind of energy is represented in the picture?

• Thermal
• Chemical
• Sound
• Nuclear