February 2025

Electric Power equations and calculations

By |2025-02-12T09:31:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Electric Power equations and calculations

  • Power calculations that you are going to be presented with in the exam are varied
  • They all depend on your knowing:
  • The equation to calculate whatever variable that you are required to calculate
  • Your ability to substitute and change the subject of the formula to suit your needs

    • […]

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The Alternating Current generator

By |2025-02-12T09:46:08+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple AC generator. Image credit electronics-tutorials.ws A simple AC generator. Image credit electronics-tutorials.ws ZIMSEC O Level Combined Science Notes: The Alternating Power generator

  • In an Alternating Current (AC) generator the current changes direction as the coil turns
  • An AC generator is made up a rectangular coil that rotates between the […]
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Investigating whether thick beams support more weight

By |2025-02-12T09:10:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Plasticine can be used to model cylinder beams. Image credit wordpress.com Plasticine can be used to model cylinder beams. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: Investigating whether thick beams support more weight

Aim: To show that thicker beams can support more weight

Materials: Plasticine/Stikistuff, wooden board, small cardboard cylinders 2cm in […]

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Experiment:To compare the effects of atmospheric corrosion on metals

By |2025-02-12T09:26:53+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Rusted metal. Image credit racingstrong.com Rusted metal. Image credit racingstrong.com ZIMSEC O Level Combined Science Notes: Experiment:To compare the effects of atmospheric corrosion on metals

Aim: To compare the effects of atmospheric corrosion on various metals

Materials:  samples of mild steel/cast iron, stainless steel, cutting steel (razor blade/old hacksaw blade), brass, aluminium, copper, plastic […]

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Experiment: Testing tooth cleaning agent

By |2025-02-12T09:17:52+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Colgate toothpaste Colgate toothpaste ZIMSEC O Level Combined Science Notes: Experiment: Testing tooth cleaning agent

Aim: To test the properties of teeth cleaning agents

Materials: various brands of toothpaste, pH paper, microscopes, slat, bicarbonate of soda, lid bottles/suitable containers for the toothpaste

Method

  1. Examine toothpaste under a microscope to compare the particle size of the various […]
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The menstrual cycle

By |2025-02-12T09:34:10+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit lifestylechallenge.deborahgabriel.com Image credit lifestylechallenge.deborahgabriel.com ZIMSEC O Level Combined Science Notes: The menstrual cycle

  • The reproductive cycle in females is called the menstrual/estrus cycle
  • It has an average of 28 days
  • It varies from individual to individual but it follows a set pattern
  • The cycle is regulated by hormones produced […]
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Waste disposal

By |2025-02-12T09:01:40+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Waste disposal in Harare. Image credit thezimbabwedaily.com Waste disposal in Harare. Image credit thezimbabwedaily.com ZIMSEC O Level Combined Science Notes: Waste disposal

  • Several terms are used when dealing with waste
  • Sewage-is the name given to human excrement (faeces and urine) when collected together.
  • Sewage also includes kitchen waste and industrial waste

    • […]

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F W Taylor’s Theory of Scientific Management

By |2025-02-12T09:20:58+02:00February 12th, 2025|Notes, O Level Business Studies Notes, Ordinary Level Notes|

A factory worker. Image credit thejournal.co.uk A factory worker. Image credit thejournal.co.uk  ZIMSEC O Level Business Studies Notes: F W Taylor’s Theory of Scientific Management

  • Taylor lived in an era when management was an ad hoc practice rather than a true and trained discipline
  • He was mainly concerned with increasing the […]
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