In the table, first column lists some energy resources. In the second column write YES if the energy source comes directly from the Sun. Write NO if it is not. Energy source Originally from Sun or not? wood fossil fuel nuclear power tidal power wind power hydroelectric power wave geothermal sunlight

Energy source Originally from Sun or not? wood Yes fossil fuel Yes nuclear power No tidal power Yes wind power Yes hydroelectric power Yes wave Yes geothermal Yes sunlight Yes Sun is the primary source of all energies. Even though almost all energies will be derived in one way or another from the Sun, only very few are coming directly from the Sun. Sunlight can be converted to electrical energy by using photovoltaic cells. Wood and fossil fuels are also coming from the energy from the Sun. But the nuclear energy is not a product of energy from the Sun. Similarly, tidal energy, wind energy and hydroelectric energy are all derived from the solar energy even though in different ways. Geothermal energy is the energy which is obtained from the sub surface of the Earth which is also coming from the Sun itself.

Fission and fusion are two processes that release energy when changes happen in the nuclei of atoms. The table lists some features of these processes. Fill the table appropriately. Feature Fission, fusion or both Large nuclei split into two two small nuclei join together energy is released used in a uranium fuelled power station the energy source of the Sun helium can be a product

Feature Fission, fusion or both Large nuclei split into two fission two small nuclei join together fusion energy is released both used in a uranium fuelled power station fission the energy source of the Sun fusion helium can be a product fusion Nuclear reactions such as fission and fusion both produce energy, but the processes are extremely different. Fission is the process of a heavy, unstable nucleus splitting into two lighter nuclei, while fusion is the process of two light nuclei combining to release massive amounts of energy. Even atom bomb uses the reaction of nuclear fission.

E M B I B E

Physics for Cambridge IGCSE workbook>Chapter 7 - Energy Resources>Exercise 7.3

David Sang and Darrell Hamilton Solutions for Chapter: Energy Resources, Exercise 3: Exercise 7.3

Author:David Sang & Darrell Hamilton

David Sang Physics Solutions for Exercise - David Sang and Darrell Hamilton Solutions for Chapter: Energy Resources, Exercise 3: Exercise 7.3

Attempt the free practice questions on Chapter 7: Energy Resources, Exercise 3: Exercise 7.3 with hints and solutions to strengthen your understanding. Physics for Cambridge IGCSE workbook solutions are prepared by Experienced Embibe Experts.

Questions from David Sang and Darrell Hamilton Solutions for Chapter: Energy Resources, Exercise 3: Exercise 7.3 with Hints & Solutions

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 7 - Energy Resources>Exercise 7.3>Q 1

What do we use to transfer the energy from the Sun into electricity?

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 7 - Energy Resources>Exercise 7.3>Q 2

In the table, first column lists some energy resources. In the second column write YES if the energy source comes directly from the Sun. Write NO if it is not.

Energy source	Originally from Sun or not?
wood
fossil fuel
nuclear power
tidal power
wind power
hydroelectric power
wave
geothermal
sunlight

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 7 - Energy Resources>Exercise 7.3>Q 3

Explain why, when we burn coal, the energy released originally came from the Sun.

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 7 - Energy Resources>Exercise 7.3>Q 4

Fission and fusion are two processes that release energy when changes happen in the nuclei of atoms. The table lists some features of these processes. Fill the table appropriately.

Feature	Fission, fusion or both
Large nuclei split into two
two small nuclei join together
energy is released
used in a uranium fuelled power station
the energy source of the Sun
helium can be a product