PAE(03/24/25): Close and Open Technology System Interaction

Which of the following best explains why a ventilator is an open system?

• It keeps air sealed within a tube

• It continuously takes in air and expels carbon dioxide

• It stores oxygen in a fixed space

• It does not exchange gases

Describe how a dialysis machine functions as a closed system.

• It circulates a cleaning solution without external exchange

• It removes waste and releases it into the air

• It continuously interacts with the surrounding environment

• It does not filter any substances

Why is a hydroponic system considered a closed system?

• It does not require water to function

• It recirculates water without external exchange

• It continuously drains water into the ground

• It does not provide nutrients to plants

Which of the following describes how an irrigation system differs from a hydroponic system?

• An irrigation system recirculates water

• A hydroponic system loses water to the environment

• An irrigation system continuously exchanges water with the surroundings

• Both are closed systems

Explain why radio transmission is an closed system.

• A cellular network operates as a closed system as it only transfers energy in the form of radio waves without exchanging physical matter.

• A cellular network operates as a closed system as it continuously sends and receives physical substances between cell towers and mobile devices.

• A cellular network operates as a closed system as it relies on external inputs of fuel and water to function properly.

• A cellular network operates as a closed system as it allows direct material exchange between users and network infrastructure.

Why is fiber-optic communication a closed system?

• Light signals travel in a contained medium without external loss

• It sends signals into the air

• It does not require cables to function

• It continuously exchanges energy with the environment

Which of the following best explains why a battery is a closed system?

• It burns fuel to generate power

• It releases gases into the environment

• It stores and releases energy without exchanging matter

Describe how a coal power plant operates as an open system.

• It stores energy without releasing it

• It burns fuel and releases heat and gases into the environment

• It keeps all energy contained within the plant

• It does not use combustion

Which of the following is a key difference between an open and closed energy system?

• Open systems store energy permanently

• Closed systems allow energy exchange with the environment

• Open systems release or receive energy from external sources

• Closed systems continuously take in external energy

Explain why a traditional irrigation system is an open system.

• It continuously takes in and releases water

• It stores water without external exchange

• It cycles water internally like a hydroponic system

• It does not use water from an external source