Understanding Energy Concepts Quiz

What is the unit of energy in the International System of Units (SI)?

• Watt

• Joule

• Newton

• Pascal

Answer explanation

The unit of energy in the International System of Units (SI) is the Joule. It is defined as the amount of energy transferred when a force of one newton is applied over a distance of one meter.

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DOK Level 1: Recall

Which of the following is an example of potential energy?

• A moving car

• A compressed spring

• A flowing river

• A spinning wheel

Answer explanation

Potential energy is stored energy. A compressed spring stores energy due to its position, making it a clear example of potential energy. In contrast, a moving car, flowing river, and spinning wheel are examples of kinetic energy.

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DOK Level 1: Recall

According to the law of conservation of energy, energy cannot be:

• Created or destroyed

• Transferred or transformed

• Measured or calculated

• Stored or released

Answer explanation

The law of conservation of energy states that energy cannot be created or destroyed, only transformed or transferred. Therefore, the correct answer is 'Created or destroyed'.

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DOK Level 1: Recall

Which of the following is a renewable source of energy?

• Coal

• Natural Gas

• Solar

• Nuclear

Answer explanation

Solar energy is renewable as it comes from the sun, which is inexhaustible. In contrast, coal and natural gas are fossil fuels that deplete over time, and nuclear energy relies on finite uranium resources.

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DOK Level 1: Recall

What type of energy conversion occurs in a hydroelectric power plant?

• Chemical to electrical

• Mechanical to thermal

• Kinetic to electrical

• Thermal to mechanical

Answer explanation

In a hydroelectric power plant, water flows from a height, converting its potential energy into kinetic energy as it moves. This kinetic energy is then transformed into electrical energy through turbines, making 'kinetic to electrical' the correct choice.

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DOK Level 1: Recall

Energy is measured in

• distance

• newton's

• joules

Answer explanation

Energy is measured in joules, which is the standard unit of energy in the International System of Units (SI). The other options, distance and newton's, do not represent energy measurements.