Energy and Energy Transfer

Mary put an egg into some water in a pot and let the water boil until the egg was cooked. How was thermal energy (heat) transferred to the egg during this process?

• Insulation allowed the heat to transfer from the pot

  through the water to the egg.

• Convection currents transferred heat from the pot through the water to

  the egg.

• Radiation currents moved heat through the water, then through the pot

  to the egg.

• Conduction transferred heat from the pot through the water to the egg.

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Gloria is making a simple electrical circuit using materials that include a battery, two wires and a light bulb. She used all of the materials but the light bulb would not light up. Which is the best explanation of why the light bulb did not light up?

• The wire is not insulated.

• She needs to create a series circuit.

• The circuit is broken.

• She needs to create a parallel circuit.

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Gregory wanted to learn how to shoot a bow and arrow. He placed the arrow in the bow, stretched the bow, and then let the arrow go toward a safe target. What type of energy does a stretched bowstring have?

• Kinetic

• Chemical

• Potential

• Electrical

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What type of energy does the arrow have after it has been shot?

• Kinetic

• Chemical

• Potential

• Electrical

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Josh wanted to know how hot the bulb on his desk lamp got. When he put his hand near the light bulb he could feel some heat. What could Josh do to measure how hot the lamp on his desk really got?

• He could place a cloth under the lamp and then feel

  the cloth.

• He could put a crayon under the lamp to see if

  it would melt.

• He could place a thermometer under the lamp.

• He could place a glass of ice under the lamp.

Electricity is needed in order for a light bulb to light up. When a lamp is plugged into the socket and turned on it will light up. Which of the following explains the energy changes that took place when the light bulb lit up?

• electrical > mechanical > light

• electrical> heat > light

• heat > light > electrical

• electrical> mechanical> chemical

Joann made some hot chocolate to drink. She stirred the hot chocolate milk with a metal spoon and noticed that the spoon handle felt warmer after resting in the hot chocolate for a few minutes. What type of energy transfer was she observing?

• Solar power transfer

• Electrical current transfer

• Heat transfer

• Fossil fuel transfer

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Peter’s brother put gas in the car so she could drive to the library. Gas is fuel that powers the car. What type of energy change takes place when the car is started and moves forward?

• kinetic energy to mechanical energy

• electrical energy to potential energy

• chemical potential energy to kinetic energy

• hydroelectric energy to kinetic energy

The newspaper had an article that stated that there

are many more white cars than darker cars that travel

the highways in Florida. This is because white cars

reflect the sun’s rays and darker cars absorb them.

Which of the following would be the best way to prove

that this statement is right?

• take a ride in each color car to see which is

  hotter

• touch a white car after it has been in the sun to

  feel the heat

• touch a black car after it has been in the sun to

  feel the heat

• put a thermometer in each color car and record the temperature

Jasmine wanted to build a solar cooker to make a snack called “S’Mores.” She covered a small box with aluminum foil. She placed a cookie sandwich that contained chocolate and marshmallows in the solar cooker. She placed the solar cooker in the sun. After thirty minutes the chocolate and marshmallows melted. Which of the following explains why they melted?

• because of the sun’s magnetic energy

• because of the sun’s radiant energy

• because of the sun’s electrical energy

• because of the sun’s mechanical energy

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