Energy Transformations

A lamp that plugs into a wall socket draws energy, which flows through a thin wire in the bulb, causing it to heat up until it glows. What energy transformations are taking place?

• Chemical → light → electrical

• Mechanical → sound → light

• Thermal → solar → electrical

• Electrical → thermal → light

Turning the handle makes a current that causes the light bulb to glow. What are the energy transformations that happen in this hand generator?

• Thermal → solar → light

• Mechanical → electrical → light

• Electrical → mechanical → light

• Solar → light → electrical

In which of the following scenarios would this energy transformation be observed?

chemical → light → heat

• Plucking a guitar string

• Lighting a match

• Turning on a fan

• Starting a car

The law of conservation of energy states ___.

• electrical energy can be transformed into other forms

• energy can be created and destroyed

• energy is never created nor destroyed

• what goes up must come down

During energy transformations, energy is never ___.

• released as heat

• used to increase an object's potential energy

• created or destroyed

• completely transformed

A baseball is hit into the air with a bat. When does baseball have the greatest gravitational potential energy?

• when it hits the ground

• when it reaches its highest point

• when it leaves the bat

• when the mechanical and kinetic energies of the baseball are equal

What type of energy is stored in a battery?

• electrical

• thermal

• radiant

• chemical

Which energy transformation occurs in a toaster?

• electrical → thermal

• chemical → thermal

• nuclear → electrical

• thermal → electrical

A battery converts what type of energy to another?

• electrical → thermal

• chemical → electrical

• kinetic → nuclear

• light → heat

Energy transformations occur when ___.

• a chemical reaction takes place

• energy changes from one form to another

• energy is created through conduction

• two forces slide together that are touching