Unit 3 Biolite

Shayna and Mike are making a list of electrical appliances that people use in their homes.

Which of the following objects best shows electrical energy being converted into mostly light energy?

• fan

• lamp

• radio

• toaster

Answer explanation

A lamp primarily converts electrical energy into light energy, making it the best choice. In contrast, a fan, radio, and toaster convert energy into motion, sound, and heat, respectively.

Tags

NGSS.HS-PS3-3

How does the total energy in the popcorn-popping system change when popcorn pops?

• Total energy will be negative when popcorn is popped.

• The popcorn creates new energy when it is popped, which is why popcorn popping is loud.

• Total energy will remain the same when popcorn is popped, but some will be transformed.

• Energy is destroyed when popcorn is popped, and it turns into matter making the kernel bigger.

Answer explanation

When popcorn pops, the total energy in the system remains constant due to the law of conservation of energy. However, the energy transforms from thermal energy to kinetic energy, causing the popping sound.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

In Data Set 2, at what time did the experimental group reach a temperature of 15°C?

• 10:00 AM

• 11:30 AM

• 1:00 PM

• 2:30 PM

Answer explanation

In Data Set 2, the experimental group reached 15°C at 11:30 AM, as indicated by the recorded temperature data. This time is confirmed by the data points leading up to that temperature.

Tags

NGSS.HS-PS3-4

According to the observations, at what temperature did the ice cream begin melting?

• 0°C

• 2°C

• 4°C

• 6°C

Answer explanation

The ice cream began melting at 2°C, as this is the temperature where the solid state transitions to liquid. Temperatures below this point, such as 0°C, do not cause melting.

Tags

NGSS.HS-PS3-4

What type of energy transformation occurs when a battery powers a flashlight?

• Chemical energy to light energy

• Mechanical energy to electrical energy

• Thermal energy to sound energy

• Gravitational energy to kinetic energy

Answer explanation

When a battery powers a flashlight, it transforms chemical energy stored in the battery into light energy, which illuminates the flashlight. This is why the correct answer is chemical energy to light energy.

Tags

NGSS.HS-PS3-3

When electricity passes through a light bulb, it is converted to _______________________.

• motion energy

• light energy

• static electricity

• magnetic energy

Answer explanation

When electricity flows through a light bulb, it is converted into light energy, which is the primary function of the bulb. Other forms of energy like motion or static electricity are not produced in this process.

Tags

NGSS.HS-PS3-3

What type of energy does a moving car possess?

• Electrical Energy

• Mechanical Energy

• Gravitational Potential Energy

• Chemical Energy

Answer explanation

The moving car possesses mechanical energy, which is the energy of motion. This energy is a result of the car's speed and mass, distinguishing it from other types of energy like electrical or chemical.

Which of these is the best example of electric energy being transformed into heat energy?

• lamp

• fan

• telephone

• toaster

Answer explanation

A toaster converts electric energy into heat energy to toast bread, making it the best example of this transformation. In contrast, a lamp primarily produces light, and a fan and telephone do not primarily generate heat.

Tags

NGSS.HS-PS3-3

Which of the following devices transforms electrical energy into mechanical energy?

• Light bulb

• Microwave oven

• Electric fan

• Television

Answer explanation

An electric fan transforms electrical energy into mechanical energy by using an electric motor to rotate its blades, creating airflow. In contrast, a light bulb, microwave oven, and television primarily convert electrical energy into light, heat, and sound.

Tags

NGSS.HS-PS3-3

What type of energy transformation occurs when a car engine burns fuel?

• Chemical energy to thermal energy

• Thermal energy to electrical energy

• Mechanical energy to chemical energy

• Electrical energy to light energy

Tags

NGSS.HS-PS1-4