Energy Transformations

Front

What energy transformations occur when a lamp plugged into a wall socket heats up and glows?

Back

Electrical → thermal → light

Front

An electric pencil sharpener uses electricity to make its motor spin. The pencil sharpener also makes noise and heats up. Which observation of the pencil sharpener demonstrates the law of conservation of energy?

Back

The amount of electrical energy used equals the total amount of mechanical, sound, and thermal energy produced.

Front

Energy transformations in a hand generator when turning the handle to light a bulb.

Back

Mechanical → electrical → light

Front

When energy enters a system and then comes out of the system later, the law of conservation of energy states that–

Back

the amount of energy coming out of the system must equal the energy that entered the system.

Front

In which scenario is the energy transformation chemical → light → heat observed? Options: Plucking a guitar string, Lighting a match, Turning on a fan, Starting a car

Back

Lighting a match

Front

Which of the following is a form of potential energy?

sound energy

,

chemical energy

,

mechanical energy

,

thermal (heat) energy

Back

chemical energy

Front

The law of conservation of energy states ___

Back

energy is never created nor destroyed

Front

How many forms of kinetic energy are there?

Back

5

Front

There are ___ forms of potential energy.

Back

4

Front

During energy transformations, energy is never ___.

Back

created or destroyed