Understanding Conservation of Energy

What is the principle of conservation of energy?

• Energy can be created and destroyed.

• Energy can be transferred, stored, or dissipated but cannot be created or destroyed.

• Energy can only be stored and not transferred.

• Energy can be created but not destroyed.

When you charge your phone, what type of energy is transferred from the main supply to the phone's battery?

• Light energy

• Sound energy

• Chemical energy

• Electrical energy

What happens to the chemical energy in your phone's battery when you use your phone?

• It is converted to light energy only.

• It is converted back to electrical energy.

• It is converted to sound energy only.

• It remains as chemical energy.

In the context of energy transfer, what is meant by "dissipated" energy?

• Energy that is stored for later use.

• Energy that is transferred usefully.

• Energy that is lost to the environment as waste.

• Energy that is created during the process.

What is a common form of wasted energy when using electronic devices like phones?

• Light energy

• Sound energy

• Heat energy

• Chemical energy

What is the difference between an open system and a closed system?

• An open system allows energy and matter to move freely, while a closed system does not.

• An open system stores energy, while a closed system dissipates energy.

• An open system creates energy, while a closed system destroys energy.

• An open system is always larger than a closed system.

If a phone is placed in a sealed jar, what type of system does it become?

• An open system

• A closed system

• An isolated system

• A dynamic system

In a closed system, what happens to the overall energy?

• It increases over time.

• It decreases over time.

• It remains constant.

• It fluctuates randomly.

What type of energy conversion occurs in a phone's screen?

• Electrical energy to sound energy

• Chemical energy to electrical energy

• Electrical energy to light energy

• Light energy to chemical energy

What type of energy conversion occurs in a phone's speaker?

• Electrical energy to sound energy

• Chemical energy to light energy

• Sound energy to electrical energy

• Light energy to sound energy