This document discusses different types of energies and electricity. It defines primary energy as energy that comes directly from natural sources like the sun, earth, or moon. Secondary energy is energy that comes from transforming primary energy into a more usable form, like electricity. Renewable energies come from sources that never run out, like solar, wind, water, and geothermal, while non-renewable energies like coal, natural gas, and oil could eventually run out. The document also outlines how electricity is generated from primary energies and transported through domestic circuits to power appliances.

1. 1
Energies & electricity
Unit 3.Lesson 1

2. Energies
Primary energy
• Energy comes from a
natural source. They are
originated by the Sun, the
Earth or the Moon.
• Renewable energies come
from sources that never run
out.
• Non-renewable energies
come from sources that
could run out.
Secondary energy
• Energy comes from the
transformation of a
primary energy.
• They are a more convenient
for transport and use
2

3. NonNon--renewable energiesrenewable energies
1) Nuclear energy:
Earth storage
Coal
2) Fossil energy: Solar storage
Natural Gas Crude Oil
3

4. Renewable energies 1Renewable energies 1
1) Direct Solar energy
Thermal use
Photovoltaic use
4

5. Renewable energies 2Renewable energies 2
2) Other Solar related energies
Wind power
Water power
Bio energy
5

6. Renewable energies 3Renewable energies 3
4) Solar and Moon energy
3) Earth energy
Geothermal power
Tide and waves power
6

7. ElectricityElectricity
2) As a Secondary energy1) As a Primary energy
Lightning Transport
Use
7

8. Electricity pathElectricity path
Primary Energy sources
Secondary energy
conversion
Electricity appliances
Electricity
transport
8

9. Domestic Electricity circuitDomestic Electricity circuit
Generation
Transport
Receptors
Switches
Mains: plugs
&sockets
Chemical
batteries
9