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Unit 1: Introduction to Energy

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Questions and Answers

What is the definition of energy?

The ability to create light

The ability to convert matter into energy

The ability to do work (correct)

The ability to create heat

Which energy resource is mentioned as being plentiful but requiring a large capital investment?

Solar energy

Geothermal energy

Wind energy (correct)

Hydropower

How is the energy of hot rocks and trapped liquids in the depths of the earth utilized?

Used for nuclear fusion

Released as electricity (correct)

Converted into light energy

Converted into mechanical energy

What is the unit used to measure mechanical energy?

Joule Signup and view all the answers

Which unit of electrical energy is convenient and commonly used in practice?

Kilowatt-hour Signup and view all the answers

How is the conversion from watt-hours to joules calculated?

$1 Wh = 3600 J$ Signup and view all the answers

What is a potential drawback of using nuclear energy?

Generation of long-lived radioactive substances Signup and view all the answers

Why are most renewable energy resources considered unreliable?

Dependency on weather conditions Signup and view all the answers

Which aspect of PV cell manufacturing involves hazardous materials?

Cleaning and purifying the semiconductor surface Signup and view all the answers

Why is energy considered crucial for the development of modern civilization?

To meet the ever-growing energy demands Signup and view all the answers

What makes energy resources significant for every country in the world?

Their role in wealth generation and economic development Signup and view all the answers

Why is fossil fuel use a hotly debated topic globally?

Given their association with economic development Signup and view all the answers