February 2025

Electrostatics/Static Electricity

By |2025-02-12T09:17:45+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Demostrating static electricity using a comb. Image credit alinasadventuresinhomemaking.com Demostrating static electricity using a comb. Image credit alinasadventuresinhomemaking.com ZIMSEC O Level Combined Science Notes:  Electrostatics/Static Electricity 

  • Electrostatics is the study of static electricity
  • Static electricity is a stationary electric charge usually generated by friction
  • It causes sparks or attraction between the […]
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Experiment: Changing chemical energy into electrical energy using a simple cell

By |2025-02-12T09:35:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple cell in action A simple cell in action ZIMSEC O Level Combined Science Notes: Experiment: Changing chemical energy into electrical energy

Aim:  To change chemical energy into electrical energy using a simple cell

Materials: 10 cm magnesium ribbon, strip of copper foil, dilute sulphuric acid/ethanoic acid, ammeter/lamp/torch bulb,connecting leads with crocodile clips, […]

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Transmission of electricity

By |2025-02-12T08:59:46+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The Power Grid. Image credit source.co.zw The Power Grid. Image credit source.co.zw ZIMSEC O Level Combined Science Notes: Transmission of electricity

  • At Hwange, Kariba, Munyati and other places AC power is generated
  • This is because the most efficient power generators produce AC power
  • In addition to that AC power can be […]
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Uses of Trusses

By |2025-02-12T09:14:28+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A girder bridge made of trusses. Image credit luetke-modellbahn.de A girder bridge made of trusses. Image credit luetke-modellbahn.de ZIMSEC O Level Combined Science Notes: Uses of Trusses

  • Trusses are used extensively in large civil structures
  • One their uses is to make girder bridges
  • These bridges are designed in such a way […]
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Introduction to bridges

By |2025-02-12T09:29:06+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple bridge. Image credit pinimg.com A simple bridge. Image credit pinimg.com ZIMSEC O Level Combined Science Notes: Introduction to bridges

  • A bridge is a structure that allows a road, path or railway line to cross a river/depression/gully/gap
  • The simplest bridge can be made using a beam lying across the gap

    • […]

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Pressure in liquids and the manometer

By |2025-02-12T09:01:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Pressure in liquids and the manometer

  • Gravity pulls a liquid down into its container
  • The liquid in turn exerts a pressure on the container
  • The pressure of a liquid at a certain depth is equal in all directions
  • The pressure of a liquid in a container increases with depth
  • This means in a container […]
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Rhythm/Natural Family Planning

By |2025-02-12T09:38:33+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit atlantablackstar.com Image credit atlantablackstar.com ZIMSEC O Level Combined Science Notes:Contraception:Rhythm/Natural Family Planning

How it works

  • Various techniques are used:
  • Learn to recognise the fertile periods in the menstrual cycle and avoid sex during that period
  • Several techniques are used to identify this fertile period:
    1. The temperature method is when […]
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Water closet/Flush toilet

By |2025-02-12T09:05:09+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Water Closet. Image credit rakbathware.com Water Closet. Image credit rakbathware.com ZIMSEC O Level Combined Science Notes: Water closet/Flush toilet

  • Is part of the water borne sewage
  • This means that wastes from the toilet are carried by water to a place where it is processed
  • This is very common in urban homes […]
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Piece Rate

By |2025-02-12T09:24:06+02:00February 12th, 2025|Notes, O Level Business Studies Notes, Ordinary Level Notes|

ZIMSEC O Level Business Studies Notes: Piece Rate

  • This when a payment is made to a worker for each unit that the worker has produced
  • Workers wages depend on the quantity they have produced
  • It does not consider the time spent by workers in producing each unit
  • Piece rate system is the method of remunerating the workers according to […]
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