Energy Types, Transformations, Work, and Power

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

• chemical → light → electrical

• mechanical → sound → light

• thermal → solar → electrical

• electrical → thermal → light

Answer explanation

The lamp converts electrical energy from the wall socket into thermal energy as the wire heats up. This thermal energy then produces light, making the correct transformation sequence electrical → thermal → light.

Tags

NGSS.MS-PS3-5

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

• chemical → light → electrical

• mechanical → sound → light

• thermal → solar → electrical

• electrical → thermal → light

Answer explanation

The lamp converts electrical energy from the wall socket into thermal energy as the wire heats up. This thermal energy then produces light, making the correct transformation sequence electrical → thermal → light.

Tags

NGSS.HS-PS3-3

When water falls through a dam and turns a turbine connected to a generator, electricity is produced. This electricity is often used to light our homes and offices. Which of the following shows the energy transformations that occur?

• electrical → light → mechanical

• chemical → mechanical → electrical

• mechanical → chemical → light

• mechanical → electrical → light

Answer explanation

When water falls, it has mechanical energy that turns the turbine. This mechanical energy is converted into electrical energy by the generator, which is then used as light energy in our homes. Thus, the correct transformation is mechanical → electrical → light.

Tags

NGSS.MS-PS3-5

The electrical energy of the stove is transferred to _____ energy.

• Solar

• Thermal

• Potential

• Electrical

Answer explanation

The electrical energy of the stove is converted into thermal energy, which is the heat produced for cooking. Therefore, the correct answer is thermal.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-3

Energy transformations occur when...

• energy is created through conduction

• energy changes from one form to another

• two forces slide together that are touching

• a chemical reaction takes place

Answer explanation

Energy transformations occur when energy changes from one form to another, such as from kinetic to potential energy. This is the fundamental principle of energy conservation and transformation.

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

Photosynthesis undergoes two energy transformations. What are these transformations?

• radiant

  chemical

• chemical

  radiant

• electrical

  nuclear

• radiant

  sound

Answer explanation

Photosynthesis involves two key energy transformations: radiant energy from sunlight is converted into chemical energy in the form of glucose. Thus, the correct transformations are radiant and chemical.

Tags

NGSS.MS-LS1-6

Some students observing a classroom device being used noticed the following energy transformations: 
Electrical → Mechanical → 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.

Answer explanation

The students observed a pencil sharpener, which transforms electrical energy into mechanical energy to rotate the blades, producing sound as it sharpens pencils. This matches the energy transformations listed.

The diagram shows a circuit with a glowing bulb. How does the energy change as it moves from inside the battery, along the wires, and through the light bulb?

• electrical → light → chemical

• light → electrical → chemical

• chemical → electrical → light

• chemical → light → electrical

Answer explanation

The energy transformation in the circuit starts with chemical energy in the battery, which converts to electrical energy as it flows through the wires, and finally transforms into light energy in the bulb. Thus, the correct sequence is chemical → electrical → light.

Tags

NGSS.MS-PS3-4

The process of changing energy from one form to another.

• transmission

• transportation

• transformation

Answer explanation

The correct answer is 'transformation' because it specifically refers to the process of changing energy from one form to another, unlike 'transmission' or 'transportation', which do not convey this meaning.

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

When water falls through a dam and turns a turbine connected to a generator, electricity is produced. The electricity is used to light a home. Which shows the energy transformation?

• electrical ➡ light ➡ mechanical

• chemical ➡ mechanical ➡ electrical

• mechanical ➡ chemical ➡ light

• mechanical ➡ electrical ➡ light

Answer explanation

The correct choice is mechanical ➡ electrical ➡ light. Water's mechanical energy turns the turbine, generating electrical energy, which is then converted to light energy to illuminate the home.

Tags

NGSS.HS-PS3-3