Integrated Science 3 - Unit 1 & 2 Revision

What does the term "electricity" describe?

• The transfer of energy that powers devices like lights.

• The storage of energy within a battery.

• The process of creating energy from sunlight.

• The generation of sound through power lines.

What is true about energy transfer to power communities during both stable conditions and blackouts?

• There are several subsystems that are important for understanding energy transfer.

• Energy always flows without interruption during a blackout.

• Energy transfer stops completely when a blackout occurs.

• Only solar energy can power communities during blackouts.

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Energy will stop transferring in a circuit when:

• A complete circuit is formed.

• The power source is turned off.

• There is a break in any of the paths (a broken circuit).

• The energy demand is too high.

What happens when you plug in an electronic device?

• It creates a giant circuit from the device to a power source that may be far away.

• The device generates its own energy.

• The device stores energy for later use.

• The device directly generates electricity from the air.

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What is a short circuit?

• A perfectly functioning circuit that powers devices.

• A circuit where energy does not flow at all.

• A direct conducting path from one side of the energy source to the ground or the other side of the source.

• A system that always causes energy to transfer efficiently.

What can cause a blackout in an energy system?

• A perfectly functioning circuit.

• A single short circuit in the system.

• The transfer of energy through normal systems.

• A balanced energy demand and supply.

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Which of the following can affect the implementation of engineering solutions?

• Engineering constraints.

• Unlimited resources.

• A lack of demand for energy.

• Unchanging environmental conditions.

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What must happen for electrical energy to be produced?

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What likely caused the spike in energy demand during the Texas blackout in February 2021?

• A drop in the supply of electrical energy.

• Cold temperatures during the event.

• A high supply of renewable energy.

• An increase in sunlight in the region.

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Where does the energy used to create electricity in a power plant come from?

• Directly from the sun.

• From Earth’s systems.

• From stored energy in the power plant.

• From the moon’s gravitational pull.