Lesson Notes By Weeks and Term v5 - Grade 4

Lesson Video

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Performance objectives

• Identify at least three electrical hazards in your home.
• Explain how to safely use electrical appliances.
• Describe what to do in an electrical emergency.
• Understand why we must respect electricity.

Lesson summary

This week, we will learn about safety around electricity. Electricity is a powerful force that we use every day to power our homes, schools, and communities.

However, it can also be dangerous if not used carefully. Understanding how to stay safe around electricity is extremely important for preventing accidents and injuries. This is particularly crucial in South Africa, where many communities may have informal settlements with potentially unsafe electrical connections, making children vulnerable. We want you to be knowledgeable and responsible citizens who can protect yourselves and others.

Lesson notes

What is Electricity? Electricity is a form of energy that powers many things we use daily. It travels through wires, like roads for tiny particles called electrons. When electrons move, they create electricity. Think of it like water flowing through pipes; the water is like the electrons, and the pipes are like the wires.

Electrical Hazards in the Home and School: It's important to recognize potential dangers.

Here are some examples: Damaged Cords and Plugs: Frayed or cracked cords and plugs can expose the wires inside. Touching these can give you an electric shock. Never use appliances with damaged cords. In South Africa, due to wear and tear and sometimes inadequate infrastructure, this is a common issue. Always report damaged cords to an adult.

Overloaded Sockets: Plugging too many appliances into one socket can cause it to overheat and potentially start a fire. Each socket has a limit to how much electricity it can safely handle.

Water and Electricity: Water conducts electricity very well. Never touch electrical appliances or outlets with wet hands or near water. This includes bathtubs, sinks, and puddles.

Power Lines: Stay far away from power lines. They carry very high voltage electricity. Do not fly kites or climb trees near power lines. This is especially crucial in areas with informal settlements where power lines might be closer to the ground.

Electrical Outlets (Sockets): Sticking objects into electrical outlets can cause a severe shock. Outlets should be covered with safety covers, especially if there are young children around.

Lightning: During thunderstorms, lightning can strike electrical systems. Stay indoors and away from electrical appliances and plumbing.

Safe Use of Electrical Appliances: Read the Instructions: Always read the instructions for any new electrical appliance before using it. This will tell you how to use it safely.

Use the Right Plug: Make sure you are using the correct plug for the outlet.

Turn Off and Unplug: When you are finished using an appliance, always turn it off and unplug it from the socket. Don't pull on the cord; pull on the plug itself.

Keep Appliances Away From Water: Never use electrical appliances near water.

Do Not Repair Yourself: If an appliance is not working properly, do not try to fix it yourself. Ask an adult to help you or take it to a qualified electrician.

Check for Damage: Before using any appliance, check for damage to the cord, plug, or appliance itself. If you see any damage, do not use it.

What to Do in an Electrical Emergency: Call for Help: If someone is getting an electric shock, do not touch them directly. Call for help immediately (e.g., 10111, or your local emergency number).

Turn Off the Power: If it is safe to do so, turn off the power at the main switch (the circuit breaker or trip switch).

Use a Non-Conductive Object: If you cannot turn off the power, use a non-conductive object, such as a wooden broom handle or a dry towel, to push the person away from the electrical source. Be very careful not to touch the person yourself.

First Aid: Once the person is away from the electrical source, check if they are breathing and have a pulse. If not, perform CPR if you are trained to do so.

Respecting Electricity: Electricity is a powerful tool, but it can be dangerous if not treated with respect. Always be aware of the potential hazards and follow safety rules. Encourage others to do the same. Remember to always inform an adult of any electrical problems, especially in areas where safety standards may be lower.

Example 1: Overloaded Socket Let's say you want to plug in your TV, your phone charger, and your games console into the same socket. If the socket isn't designed to handle that much power, it could overheat. This overheating can melt the wires inside the wall and start a fire. In many South African homes, particularly in informal settlements, this is a real risk. It's better to use multiple sockets that are appropriately rated or a power strip with a built-in circuit breaker.

Example 2: Water Near Electricity Imagine you are drying your hair with a hairdryer in the bathroom, and your hands are wet. If the hairdryer falls into the sink full of water, the electricity will travel through the water and could give you a deadly shock. Even a small amount of water can be dangerous. Guided Practice (With Solutions)

Question 1: Thando sees a cable with exposed wires sticking out of the wall in his house. What should he do?

Solution: Thando should immediately tell a responsible adult (parent, guardian, teacher) about the exposed wires. He should NOT touch the wires himself or try to fix them. The adult will then be able to call an electrician to repair the problem safely.

Commentary: Emphasizes the "tell an adult" principle for safety.

Question 2: Nomusa is playing near a pylon with overhead electrical cables and her kite gets stuck in the cables. What should she do?