Energy transformation Flashcards

Front

A student constructed a simple motor.

When connected correctly, the coil of copper wire spins. Which of the following best describes the energy transformations that takes place to make the copper wire spin?

Back

mechanical energy to electrical energy to chemical energy

Front

The term, transform, means to change into a new form. Which of the following is the best example of chemical energy being transformed into light energy and heat energy?

Back

turning on a battery-powered flashlight

Front

A student is working on his homework at his desk. He turns on his desk lamp, which uses a 60-watt light bulb. After an hour, he finishes his homework and reaches to turn off the lamp. When he touches the top of the lamp, he notices that it feels warm. Why does the top of the lamp feel warm?

Back

Some of the electrical energy was changed to heat.

Front

Energy from the Sun is transferred through a food chain. Which of the following best explain a part of this process?

Back

Light energy from the Sun is transformed into mechanical energy in producers.

Front

A student is working on his homework at his desk. He turns on his desk lamp, which uses a 60-watt light bulb. After an hour, he finishes his homework and reaches to turn off the lamp. When he touches the top of the lamp, he notices that it feels warm. Why does the top of the lamp feel warm?

Back

Some of the electrical energy was changed to heat.

Front

Energy cannot be created nor destroyed, only changed from one form to another. How does listening to music on a radio obey the law of conservation of energy?

Back

Electrical energy is changed into other forms of energy such as sound.

Front

What is the amount of energy transferred from each level in the above illustration? 

Back

10%  

Front

Which of the following statements best defines the law of conservation of mass?  

Back

The mass of a closed system cannot change over time; mass cannot be created nor destroyed.  

Front

How can the law of conservation of energy be expressed in the case of a chemical reaction?  

Back

Total energy before the reaction is always equal to the total energy after the reaction.