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: 9
Grade code: 1.3.1.LI.1
Strand code: 3
Sub-strand code: 1
Content standard code: 1.3.1.CS.1
Indicator code: 1.3.1.LI.1
Theme: ELECTRIC FIELD, MAGNETIC FIELD AND ELECTRONICS
Subtheme: ELECTROSTA TICS
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This lesson introduces the fundamental concept of electrostatics – the study of stationary electric charges. We encounter electrostatics daily, sometimes without even noticing! Have you ever received a small shock after walking on a carpet and touching a metal doorknob? Or seen a balloon stick to the wall after rubbing it on your hair? These are all examples of static electricity. Understanding these basic principles is the first step to understanding everything from lightning during Ghana's rainy season to how everyday devices like photocopiers and paint sprayers work. By learning about positive and negative charges, we build the foundation for all future topics in electricity.
A. The Structure of the Atom: The Origin of Charge Everything around us is made of tiny particles called atoms. To understand electric charge, we must first look inside the atom. An atom contains three main subatomic particles: Protons: Found in the centre (nucleus) of the atom. They have a positive (+) charge. Neutrons: Also in the nucleus. They have no charge (they are neutral). Electrons: Orbit the nucleus in shells. They have a negative (-) charge.
In a normal, or neutral, atom, the number of protons is equal to the number of electrons. The positive charges of the protons perfectly cancel out the negative charges of the electrons, so the atom has no overall charge.
> Key Idea: Electric charge comes from protons and electrons. An object's overall charge depends on the balance between these two particles. Importantly, in most situations, it is the electrons that move from one object to another, not the protons which are fixed in the nucleus.
B. Defining Electric Charge Electric Charge is a fundamental property of matter that causes it to experience a force when placed in an electromagnetic field. Positive Charge: An object has a net positive charge if it has lost electrons, meaning it has more protons than electrons. Negative Charge: An object has a net negative charge if it has gained electrons, meaning it has more electrons than protons.