Energy Transformation - 705

1. A student investigated the energy transformations that occur when a call is placed from cell phone A and received by cell phone B. The student drew a diagram to show the process. Based on the diagram, what evidence is there for the transformation of chemical energy into electrical energy, and which other energy transformations must occur for the call to be received by cell phone B?

• Evidence:

  Cell phones are powered by a battery that produces the electricity used to send or receive a call.

  Transformation 1: Sound energy is transformed into

  electrical energy by cell phone A.

  Transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station

• Evidence:

  Cell phones are powered by a battery that produces the electricity used to send or receive a call.

  Transformation 1: Sound energy is transformed into

  electromagnetic waves by cell phone A.

  Transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B.

• Evidence:

  Base stations are powered by a battery that produces the electricity used to receive and forward a call.

  Transformation 1: Sound energy is transformed into electrical energy by cell phone A.

  Transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station

• Evidence:

  Base stations are powered by a battery that produces the electricity used to receive and forward a call.

  Transformation 1: Sound energy is transformed into electromagnetic waves by cell phone A.

  Transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-5

The blades of a toy helicopter spin when its circuit is connected to a battery. Which sequence below correctly identifies the energy changes taking place in the helicopter?

• chemical to electrical to potential

• chemical to electrical to mechanical

Tags

NGSS.HS-PS3-3

1. Using the image identify the three forms of heat transfer.

Conduction (CD), Convection (CV) Radiation (R).

• A: CD - B: CV - C: R

• A: R - B: CD - C: CV

• A: CV - B: CD - C: R

• A: R - B: CV - C: CD

Tags

NGSS.HS-PS3-4

Two students place three ice cubes in a glass of water that was at room temperature. Which of the following scenarios would best describe the results of the investigation?

• Energy from the water will transfer to the ice cubes, causing the ice to melt.

• Cold from the ice cubes will transfer to the water, causing the water to cool.

Tags

NGSS.HS-PS3-4

Which of the following gadgets best shows the transformation of energy from electrical to mechanical with the correct reasoning?

• A light bulb because electricity is being used to create light and heat.

• A fan because electricity is being used to spin the blades of the fan.

Tags

NGSS.HS-PS3-3

Choose the statement below that best describes the transfer of energy from the Sun to the Earth.

• The sun is radiation because it heats the Earth through an open space

• The Sun is convection because it transfers cold air to hot air

A large cup of ice is poured into a glass pitcher of freshly brewed hot tea. The ice melts quickly and the tea in the glass pitcher gets much colder. If we wait twenty-four hours, what temperature would we expect the tea and ice mixture to reach?

• The tea transferred energy to the ice making it melt. The mixture will be the temperature of the hot tea.

• The tea transferred energy to the ice until they had equal amounts of energy. They will reach a temperature somewhere between each of their original temperatures.

Tags

NGSS.HS-PS3-4

Look at the images below and choose the one that represents a change in which water freezes.

• 
• 

Tags

NGSS.HS-PS3-4

What is the energy transformation that occurs in an electric pencil sharpener?

• mechanical energy to electrical energy

• electrical energy to mechanical energy

• radiant energy to sound energy

• chemical energy to mechanical energy

Tags

NGSS.4-PS3-2

NGSS.4-PS3-4

How does a windmill change forms of energy?

• Mechanical to electrical

• Electrical to mechanical

• Mechanical to light

• It is unable to change forms

Tags

NGSS.HS-PS3-3