Lesson Notes By Weeks and Term v4 - SHS 1
ELECTROSTA TICS
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ELECTROSTA TICS
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Subject: Physics
Class: SHS 1
Term: 2nd Term
Week: 4
Grade code: 1.2.2.LI.4
Strand code: 3
Sub-strand code: 1
Content standard code: 1.2.2.CS.2
Indicator code: 1.2.2.LI.4
Theme: ELECTRIC FIELD, MAGNETIC FIELD AND ELECTRONICS
Subtheme: ELECTROSTA TICS
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This lesson introduces the fascinating world of Electrostatics, the study of stationary electric charges. We experience electrostatics every day, especially during the dry Harmattan season in Ghana when we get a small shock touching a metal doorknob or see our clothes cling together. This topic forms the foundation for understanding all of electricity, from the lightning in our skies to the smartphones in our pockets. By understanding static electricity, we begin to uncover the fundamental forces that govern our universe.
This section breaks down the core content for the lesson. A. The Structure of the Atom and Electric Charge To understand electricity, we must first look at the tiny particles that make up all matter: atoms. An atom has a central part called the nucleus, which contains: Protons: Positively charged particles (+). Neutrons: Particles with no charge (neutral). Whizzing around the nucleus are electrons, which are negatively charged particles (-). In a normal, or neutral, atom, the number of protons (+) is equal to the number of electrons (-). The positive and negative charges cancel each other out, so the atom has no overall charge.
Key Idea: Electric charge is a fundamental property of matter carried by protons and electrons. It is not something we create; we only move it around. Crucially, only electrons can move easily from one atom to another. The protons are locked in the nucleus. An object becomes negatively charged when it gains extra electrons. It now has more electrons (-) than protons (+). An object becomes positively charged when it loses electrons. It now has fewer electrons (-) than protons (+). B. What is Static Electricity? Static electricity is the build-up of an electric charge on the surface of an object. It is called "static" because the charges remain in one area for a time, rather than moving or flowing as they do in an electric current. This build-up happens when there is an imbalance between the number of protons and electrons in the material. C. The Fundamental Law of Electrostatics This is the single most important rule in this topic: Like charges repel: Two positive charges will push each other away. Two negative charges will also push each other away. Unlike charges attract: A positive charge and a negative charge will pull towards each other.
A charged object can also attract a neutral object through a process called polarisation, but for SHS1, we focus on the main law. D. Charging by Friction (The Triboelectric Effect) This is the simplest way to create static charge. Process: When two different materials are rubbed together, electrons can be transferred from one material to the other. Why? Some materials hold onto their electrons more tightly than others. When rubbed, the material with the weaker hold will lose electrons, and the material with the stronger hold will gain them. The Triboelectric Series is a list that ranks materials based on their tendency to gain or lose electrons.