O Level Science Notes Archives - Page 2 of 33 - Free ZIMSEC & Cambridge Revision Notes

Liquification of air

By garikaib|2022-09-15T12:39:08+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Sable chemicals plant. Image credit zimeye.net ZIMSEC O Level Combined Science Notes: Liquification of air

In Zimbabwe the air liquification plant is at Sable Chemicals
Two main components of air are separated:
Nitrogen and Oxygen
These two gases are used in either liquid or gas form

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Ethanol as a source of energy
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Ethanol as a source of energy

Notes, O Level Science Notes, Ordinary Level Notes

Ethanol as a source of energy

By garikaib|2022-09-15T12:38:57+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

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

Ethanol is also known as alcohol
It is made by fermenting plants with a high sugar content
Sugar cane is commonly used to make ethanol in Zimbabwe
The plant is grown in Zimbabwe’s Lowveld
Water from Mutirikwe and Bangala Dams is used to irrigate the crop
Biomas is […]

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Science:Lighting

By garikaib|2022-09-15T12:38:49+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Lightining is a result of electrostatic discharge. Image credit zmescience.com ZIMSEC O Level Combined Science Notes: Conductors and insulators

Clouds are poor conductors because they are made of mostly water particles
They may become charged due to friction forces within them […]

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Photovoltaic cells/Solar Panels

By garikaib|2022-09-15T12:38:41+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Solar Panels. Image credit digitaltrends.com ZIMSEC O Level Combined Science Notes: Photo-voltaic cells/Solar Panels

Solar cells convert radiation from the sun into electrical energy
These cells are mad from silicon
Which is a semiconducting material
While most metals are good conductors of electricity because they […]

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A simple D.C motor

By garikaib|2022-09-15T12:38:32+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

dc_motor-min DC motor. Image credit kostov-motors.com ZIMSEC O Level Combined Science Notes: Experiment: Demonstrating that an electric wire moves in a magnetic field

A DC motor converts direct electric current into kinetic energy
It has a stator
Stator-a stationary magnet found within a DC motor
It also has a many coils […]

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Types of joints

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

Brazing. Image credit samarthenggworks.com ZIMSEC O Level Combined Science Notes:Types of joints

The main function of a joint is to transmit load from one part of a structure to another
This usually results in the joint being subjected to a lot of stress and weakening the structure

[…]

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Suspension bridge

By garikaib|2022-09-15T12:38:17+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The Hong Kong Bridge. Image credit plus.maths.org ZIMSEC O Level Combined Science Notes: Suspension bridge

Old suspension bridges were usually built using rope/vegetable fibre
The ropes could withstand tension forces while they were new but they would quickly deteriorate
Suspension bridges are usually constructed […]

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