Lesson Notes By Weeks and Term v4 - SHS 1
POWERING THE FUTURE WITH ENERGY FORMS
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POWERING THE FUTURE WITH ENERGY FORMS
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: General Science
Class: SHS 1
Term: 1st Term
Week: 8
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: VIGOUR BEHIND LIFE
Subtheme: POWERING THE FUTURE WITH ENERGY FORMS
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This lesson introduces learners to the fascinating world of solar energy, a clean and abundant power source that is critical for Ghana's future. As a country blessed with ample sunshine, understanding how to harness this energy is not just a scientific concept but a practical skill for national development. We will move beyond theory to hands-on application by designing and building a simple, functional model of a solar panel using materials we can find in our homes and school environment.
A. What is Solar Energy?
Solar energy is the energy that comes from the sun. The sun is a giant nuclear reactor that releases a massive amount of energy in the form of light and heat. This energy travels through space and reaches the Earth. We can capture this energy and convert it into other useful forms, like electricity. B. The Photovoltaic (PV) Effect: How Solar Panels Make Electricity
This is the magic behind solar panels. The word "photo" means light, and "voltaic" relates to electricity. So, the photovoltaic effect is the process of converting light directly into electricity. Step 1: The Material Matters. Solar panels are made of special materials called semiconductors. The most common one is silicon, which is found in sand. For our DIY project, we will create a semiconductor layer using copper oxide on a copper sheet. Step 2: Sunlight Strikes. Sunlight is made of tiny packets of energy called photons. When these photons from the sun strike the surface of the semiconductor material in the solar panel, they transfer their energy to it. Step 3: Electrons Get Excited. Inside the semiconductor are particles called electrons. Normally, these electrons are held tightly within their atoms. The energy from the photons is like a knock, giving the electrons enough energy to break free from their atoms. Step 4: Creating an Electric Current. Once an electron is knocked loose, it needs a path to travel. The solar cell is designed with a built-in electric field (like a one-way street) that forces these freed electrons to flow in a specific direction. This flow of electrons is what we call an electric current. Step 5: Capturing the Power. Metal contacts on the top and bottom of the solar cell collect these flowing electrons. When we connect these contacts to a device (like a small LED or a multimeter) using wires, the electric current flows through the device and powers it.
Analogy: Imagine a coconut tree (the semiconductor atom) with coconuts (electrons) on it. A strong wind (sunlight photons) blows and knocks a coconut loose. If we have a sloping channel (the electric field) at the base of the tree, the fallen coconut (the freed electron) will roll down the channel (flow as current). C. From a Single Cell to a Panel Solar Cell: A single unit that performs the photovoltaic effect. It produces a very small amount of electricity (e.g., about 0.5 volts). Solar Panel (or Module): To get useful power, many individual solar cells are connected together in a grid-like pattern and placed in a protective frame. Series Connection: Connecting cells positive-to-negative increases the total voltage. Parallel Connection: Connecting cells positive-to-positive and negative-to-negative increases the total current. Solar Array: For large power needs (like powering a whole house or school), multiple panels are connected together to form an array. D. Materials for a DIY Solar Panel (Our Project)