fuels Archives - Free ZIMSEC & Cambridge Revision Notes

The carburetor

By garikaib|2022-09-15T12:38:53+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

A carburettor is an important part of the Petrol engine. Image credit MediaWiki

A carburettor is an important part of the Petrol engine. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The carburetor

A carburettor is an essential part of Petrol engines
A typical carburettor has the following parts:
An […]
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The Diesel engine

By garikaib|2022-09-15T12:38:53+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Honda Diesel Engine. Image credit forum.cardekho.com

Honda Diesel Engine. Image credit forum.cardekho.com ZIMSEC O Level Combined Science Notes: The Diesel engine

Operates in almost the same way as the Petrol Engine apart from certain differences:
They use diesel instead of Petrol
Have no spark plugs
Have a fuel injector instead […]
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Types of fuel

By garikaib|2022-09-15T12:39:00+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Engen Garage. Image credit chronicle.co.zw

Engen Garage. Image credit chronicle.co.zw ZIMSEC O Level Combined Science Notes: Types of fuel

A fuel is any type of material that can be made to react (commonly with oxygen) and release energy in the process
Fuel provides energy to a body/machine to do work
Fuels […]
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Efficiency: Diesel vs Petrol engines

By garikaib|2022-09-15T12:38:52+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Petrol vs Diesel Engines. Image credit carblogindia.com

Petrol vs Diesel Engines. Image credit carblogindia.com ZIMSEC O Level Combined Science Notes: Efficiency: Diesel vs Petrol engines

Efficiency refers to the fuel economy of an engine
It measures the amount of chemical energy in the fuel that is converted to kinetic energy
The […]
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Experiment: Burning fuels

By garikaib|2022-09-15T12:39:00+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Burning Fuels

Burning Fuels ZIMSEC O Level Combined Science Notes: Experiment: Burning fuels

Aim: To burn and investigate the nature of fuels

Materials: methylated spirits/alcohol, candle, meths burner, bunsen burner, paraffin, tin lid or porcelain dish, tongs

Method

Light a meths burner and observe the flame
Burn a small amount of alcohol on a tine lid, […]
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Social and economic factors to consider when using fuels

By garikaib|2022-09-15T12:38:52+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Oil spills are destructive to vegitation. Image credit africanewscircle.com

Oil spills are destructive to vegetation. Image credit africanewscircle.com ZIMSEC O Level Combined Science Notes: Social and economic factors to consider when using fuels

The extraction and consumption of fuels has led to a lot of problems in recent years
Problems include:

[…]

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Coal as a fuel

By garikaib|2022-09-15T12:38:59+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Coal Mining at Hwange. Image credit chronicle.co.zw

Coal Mining at Hwange. Image credit chronicle.co.zw ZIMSEC O Level Combined Science Notes: Coal fuel

Coal is a common solid fuel
It is a non-renewable resource
It is used as a raw material by industries such as at ZISCO and less commonly as a […]
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The manufacture of coke at Hwange

By garikaib|2022-09-15T12:38:59+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Raw Coke. Image credit MedialWiki

Raw Coke. Image credit MedialWiki ZIMSEC O Level Combined Science Notes: The manufacture of coke at Hwange

Coke is a hard prous residue formed when coking coal is heated to 1250°C in the absence of air
It is almost pure carbon
It is often used as […]
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Experiment:Making coke and collecting the resulting gases

By garikaib|2022-09-15T12:38:58+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Making coke

Making coke ZIMSEC O Level Combined Science Notes: Experiment:Making coke and collecting the resulting gases

Aim: To make coke using coal and collect the gas and liquid by-products

Materials: crushed coal, test tubes, glass tubing, splints, lead ethanoate solution, filter paper, red and blue litmus paper, sodium hydroxide solution, beaker, water, trough, […]

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Biogas as a source of energy
Gallery
Biogas as a source of energy

Notes, O Level Science Notes, Ordinary Level Notes

Biogas as a source of energy

By garikaib|2022-09-15T12:38:58+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Biogas as a source of energy

Biogas is the gas that is obtained from fermenting manure and other organic waste
It is a mixture of methane, carbon dioxide and hydrogen sulphide
Cattle manure is commonly used as a waste to feed biogas plants
Small plants have been built in some parts of Zimbabwe

[…]

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January 2023

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2022 O Level Results Out