energy Archives - Page 3 of 3 - Free ZIMSEC & Cambridge Revision Notes

Africa’s Energy Resources

By Rachel Majaya|2025-02-12T08:58:20+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Old Inga Dam DRC. Image credit internationalrivers.org

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Energy resources of Africa

Electricity is generated from two major processes, thermal and hydro.
The thermal component includes petroleum on top of coal for a number of countries such as Egypt, Algeria, Nigeria and Libya.
For other […]

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Energy:The siting and production of Hydro-electric power: Gorges

By Rachel Majaya|2025-02-12T09:27:59+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Kariba dam wall. Image credit Bloomberg.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:The siting and production of HEP

Site refers to the actual ground on which something is happening.
The siting of a hydro-electric power station depends on a number of physical factors.

Gorge

A gorge is a deep narrow […]

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Advantages and Disadvantages of coal as a source of energy

By Rachel Majaya|2025-02-12T08:58:53+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Burning coal

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Advantages and Disadvantages of coal as a source of energy

Advantages

Relatively high energy amount.
Fairly plentiful with global estimate use of 4 000 years.
Employment creation in mining, processing, burning and distribution.
Has many other industrial uses.
Relatively cheap energy source.

Disadvantages

Non-renewable […]

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The siting and production of hydro-electric power: Rivers and Space

By Rachel Majaya|2025-02-12T09:28:25+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

The Zambezi River and the Victoria Falls. Image credit thesafarisource.com/

ZIMSEC O Level Geography Notes: Natural Resources: Energy:The siting and production of hydro-electric power

Large perennial rivers

These are also important and necessary for establishing HEP stations.
These ensure a constant supply of a large volume of water required.
When the rivers […]

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Advantages and Disadvantages of Oil/Petroleum as a source of energy
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Advantages and Disadvantages of Oil/Petroleum as a source of energy

Notes, O Level Geography, Ordinary Level Notes

Advantages and Disadvantages of Oil/Petroleum as a source of energy

By Rachel Majaya|2025-02-12T08:59:26+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

ZIMSEC O Level Geography Notes: Natural Resources: Energy: Advantages and Disadvantages of Natural gas as a source of energy

Advantages

Has high energy output, an efficient energy source.
Relatively cleaner compared with coal.
Easy to mine if land-based oilfields.
Easy to transport through pipelines.
Can be used to power vehicles
Relatively cheap.
Has a lot of other industrial uses.

Disadvantages

Environmentally […]

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Energy:Thermal power

By Rachel Majaya|2025-02-12T09:28:46+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Hwange Thermal Power Station. Image credit businessdaily.co.zw

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Thermal power

In thermal power production, fuel is used to heat water in huge boilers, converting this water into steam.
The steam at high pressure and through pipes, is directed to turbines.
The pressure turns the turbines […]

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