February 2025

Electrical safety concepts

By |2025-02-12T09:06:05+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Three pin plug Three pin plug. Image credit tlc-direct.co.uk ZIMSEC O Level Combined Science Notes: Electrical safety

  • The following concepts and terms have to be understood:
  • Short circuit
  • Overloading
  • Earthing
  • Fuses
  • Three pin plug
  • Two pin plug

Short circuit

  • this is when a wire breaks and comes in contact with […]
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Timber properties and timber structures

By |2025-02-12T09:20:56+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A wooden house. Image credit designrulz.com A wooden house. Image credit designrulz.com ZIMSEC O Level Combined Science Notes:Timber properties and timber structures

  • Wood is a popular material in the construction industry
  • Wood is light and has a high strength/mass ratio
  • Light, strong beams/trusses are a priority in the building of houses

    • […]

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Experiment: Lever position and mechanical advantage

By |2025-02-12T09:37:53+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Lever position and effort Lever position and effort ZIMSEC O Level Combined Science Notes: Experiment: Lever position and mechanical advantage

Aim: To show that mechanical advantage depends on lever position

Materials: 1m rectangular poplar wood pieces, string, measuring tape, weights, clamp

Method

  1. Cut a grooves at 20cm, 40 cm and 50 cm lengths from the right […]
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Hydraulic Jack

By |2025-02-12T09:09:30+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Hydraulic Jack

  • Has a large ram attached to the piston in a large cylinder

The diagram of the Hydraulic Jack. Image credit slideplayer.com

The diagram of the Hydraulic Jack. Image credit slideplayer.com

  • A piston in a small cylinder is worked by a handle
  • Pressure on this cylinder when […]
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Contraception: Sterilisation

By |2025-02-12T09:45:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Black couple. Image credit blackcouplegetaways.com Black couple. Image credit blackcouplegetaways.com ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

How it works

  • Can be done in both men and women
  • In men it is known as a vasectomy
    • Sperm duct is cut and tied
    • During sexual intercourse ejaculated fluid contains no sperm

    • […]

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Leadership: Introduction

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

Barack Obama

ZIMSEC O Level Business Studies Notes: Leadership: Introduction

  • Leadership is the art or process of influencing others so that they perform tasks that have been assigned to them in an efficient and effective manner
  • The others may be followers, employees or subordinates
  • The followers/subordinates/employees have to perform these […]
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Communication in Business: Notice Boards

By |2025-02-12T09:39:48+02:00February 12th, 2025|Notes, O Level Business Studies Notes, Ordinary Level Notes|

Notice Board. Image credit blogspot.google.com

ZIMSEC O Level Business Studies Notes: Leadership: Communication in Business: Notice Boards

  • Is a surface intended for the posting of public messages
  • For example upcoming meetings, events, provide information, announce a sale etc
  • They are also known as bulletin boards, notice boards or pin boards or simply […]
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