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: 6
Grade code: 1.3.1.LI.2
Strand code: 3
Sub-strand code: 1
Content standard code: 1.3.1.CS.1
Indicator code: 1.3.1.LI.2
Theme: ELECTRIC FIELD, MAGNETIC FIELD AND ELECTRONICS
Subtheme: ELECTROSTA TICS
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Welcome, students! Have you ever felt a small shock when you touched a metal doorknob after walking on a carpet? Or have you seen how a plastic ruler, after being rubbed on your hair, can pick up tiny pieces of paper? These everyday experiences are caused by electrostatics – the study of stationary electric charges. Understanding this topic is crucial because the movement of tiny particles, called electrons, is the foundation of almost all the technology we use in Ghana today, from charging our mobile phones with ECG power to the operation of televisions and computers.
Concept 1: The Atom - The Building Block of Everything
Everything around us – the desk, the air, our bodies – is made of tiny particles called atoms. An atom has two main parts: The Nucleus: This is the dense, central core of the atom. It contains: Protons: Positively charged particles (+). They are heavy and are locked tightly together in the nucleus. Protons do not move from their position. Neutrons: Neutral particles (no charge). They are also heavy and locked in the nucleus. The Electron Shells (or Orbitals): These are regions surrounding the nucleus where tiny, very light particles called electrons orbit. Electrons: Negatively charged particles (-). They are thousands of times lighter than protons and are constantly moving.
Key Idea: In a neutral atom, the number of positive protons in the nucleus is exactly equal to the number of negative electrons orbiting it. This balance means the atom has no overall charge. *Example:* A neutral Carbon atom has 6 protons (+) and 6 electrons (-). The total charge is (+6) + (-6) = 0. Concept 2: The Electron - The Mobile Charge Carrier
The central point of this lesson is understanding why electrons move. The electrons in the outermost shell are called valence electrons. They are the furthest from the nucleus and are held less tightly by the positive pull of the protons. Because they are light and loosely held, it takes very little energy to make them jump from one atom to another.