energy Archives - Free ZIMSEC & Cambridge Revision Notes

Small scale energy sources and plants:Bio-fuel

By Rachel Majaya|2022-09-15T12:34:33+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Jatropha plant. Image credit jatropha.org.za

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Small scale energy sources and plants:Bio-fuel

is a fuel that is produced through contemporary biological processes,
such as agriculture and anaerobic digestion,
rather than a fuel produced by geological processes such as those involved in the formation of fossil […]
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Small scale energy sources: Wood stove

By Rachel Majaya|2022-09-15T12:34:33+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Wood stove. Image credit quadrafire.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Small scale energy sources and plants:Wood stove

A wood stove is a heating appliance capable of burning wood fuel and wood-derived biomass fuel, such as wood pellets.
Wood stove are usually made using a combination of metal(iron) and bricks

[…]

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River Deposition

By garikaib|2022-09-15T12:44:06+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes, River Processes|

River deposition (left bank). Image credit Panoramio.

River deposition (left bank). Image credit Panoramio. ZIMSEC O Level Geography Notes: River deposition

Deposition occurs when a river no longer as sufficient energy to transport its load.
When its velocity begins to fall and has less energy, a river’s competence (maximum size of material […]
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Energy resources in Zimbabwe

By Rachel Majaya|2022-09-15T12:34:32+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Wood is a popular fuel source in Zimbabwe. Image credit Flickr.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Energy resources in Zimbabwe

The major sources of Zimbabwe’s electrical energy are coal from Hwange and water at Kariba HEP station.
Wood makes small but significant contributions.
All the oil products used in […]
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Energy: Introduction

By Rachel Majaya|2022-09-15T12:34:40+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Power-line to transmit electrical energy

ZIMSEC O Level Geography Notes: Natural Resources:Energy

Energy is power.
It may exist in the form of potential or kinetic energy or in the form of fossil fuels and hydrocarbons.
It is also found in the form of light or heat energy.
Its sources cover all […]
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The energy crisis in Zimbabwe

By Rachel Majaya|2022-09-15T12:34:32+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Polling Stations in the Dark. Image credit mg.co.za

ZIMSEC O Level Geography Notes: Natural Resources: Energy:The energy crisis in Zimbabwe

The energy crisis in Zimbabwe is demonstrated through the following:

Frequent shortages of petroleum and its products resulting in long queues for the scarce commodity at service stations.
Fluctuating prices in the […]
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Classification of energy sources

By Rachel Majaya|2022-09-15T12:34:40+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Natural Gas flame. Image credit money.cnn.com

ZIMSEC O Level Geography Notes: Natural Resources:Energy: Classification of energy sources

One way of classification is by grouping energy sources into traditional and modern sources.

Some sources and types belong to both groups.
For example canoeing down a river uses the force of the moving […]
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Possible measures to solve the energy crisis in Zimbabwe

By Rachel Majaya|2022-09-15T12:34:31+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Cahora Bassa Dama Mozambique.Image credit zambezitraveller.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:The energy crisis in Zimbabwe:Measures

Measures have been put in place to try to resolve the energy crisis in Zimbabwe. These include:

Imports of electricity from countries overproducing it for example from South Africa through the Insukamini interconnector near […]
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Hydro-electric power

By Rachel Majaya|2022-09-15T12:34:40+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

A hydro-electric power station. Image credit MediaWiki

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Hydro-electric power

At a hydro-electric power plant, water leaves the lake or reservoir at high pressure (speed) and goes through pen stocks (concrete or steel pipes) to the turbines in a power house underground.
The force of […]
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Africa’s Energy Resources

By Rachel Majaya|2022-09-15T12:34:31+02:00January 24th, 2023|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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January 2023

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2022 O Level Results Out