Energy Transformations Quiz

Observe the photo. A flashlight runs on batteries. When the flashlight is switched on, what energy transformation occurs inside one of the batteries?

• electrical energy to light energy

• chemical energy to light energy

• chemical energy to electrical energy

• light energy to chemical energy

Observe the solar panels for this highway sign. The panels provide the energy for the light bulbs in the sign. What set of energy transformations occur in this highway sign?

• electrical energy to light energy

• light energy to sound energy

• light energy to electrical energy

• light energy to electrical energy, and then to light energy again

Fill in the blanks using the available answer choices. Danica investigated how the volume setting of her cell phone affects the battery. She set the volume control to either low, medium, or high, and then measured how long the battery lasted before it needed to be recharged. The table shows her results.

• chemical

• more

Observe the photo. Karen claims that a campfire transforms the energy in firewood into only two other forms: light energy and thermal energy. Which observation provides evidence against Karen’s claim?

• The campfire burns out after about four or five hours.

• Ashes from the campfire remain hot after the fire has stopped burning.

• The fire makes crackling or hissing noises as it burns.

• Campers warmed themselves in the heat from the fire.

Observe the diagram. Naomi is investigating the energy transformations in the circuit shown here. When she disconnects one wire from the light bulb, which energy transformations are stopped?

• only the energy transformation that occurs in the light bulb

• only the energy transformation that occurs in the battery

• only the energy transformation that occurs in the wires

• all energy transformations in the circuit, including in the battery and light bulb

The photos show two kinds of kitchen stoves. How do energy transformations compare between the two stoves?

• Two different energy sources are both transformed into electrical energy.

• Two different energy sources are both transformed into thermal energy.

• The same energy source is transformed into either electrical energy or thermal energy.

• Thermal energy is transformed into either electrical energy or light energy.

Which example shows electrical energy being transformed directly into thermal energy and mechanical energy?

• A hair dryer blows hot air.

• A hamburger is frying on an electric stove.

• A solar-powered calculator is used to solve a math problem.

• A gasoline-powered car is moving along a highway.

LaKeesha has assembled an electric circuit from a battery, light bulb, wires, and a switch. The circuit transforms electrical energy into light energy. Which steps are necessary to change the circuit so that it transforms electrical energy into sound energy, not into light energy?

• Replace the switch with a doorbell.

• Replace the battery with a doorbell.

• Replace the light bulb with a doorbell.

• Connect one wire between the battery and a doorbell.

Observe the photo. Brendan takes apart a flashlight to investigate how it works. Which two parts transform energy either to or from electrical energy? Select two correct answers.

• battery

• wires

• light bulb

• switch

• plastic casing

Observe the photo. Wool is a fabric that comes from sheep. Why do wool clothes help people stay warm in cold weather?

• Wool is a thermal conductor that carries the heat the body releases.

• Wool is a thermal insulator that traps the heat the body releases.

• Wool transforms chemical energy into thermal energy.

• Wool takes up thermal energy from the air and carries it to the body.