Lesson Notes By Weeks and Term v5 - Grade 5

Lesson Video

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Performance objectives

• Identify the basic parts of a circuit (battery, wires, bulb, switch).
• Build a simple circuit that can light a bulb.
• Explain how a closed circuit allows electricity to flow.
• Tell the difference between an open and a closed circuit.
• Predict what happens when you add more batteries to a circuit.

Lesson summary

This week, we begin our exciting journey into the world of electrical circuits! Electricity is everywhere around us. It powers our lights at home during Eskom's load shedding, keeps our phones charged so we can connect with friends and family, and even helps us cook our favourite meals. Understanding how electricity flows in a circuit is crucial for anyone living in South Africa, as it allows us to be responsible users of energy and potentially even troubleshoot simple electrical problems around the house (with adult supervision, of course!). We'll be focusing on the basic components of a circuit and how they work together to light a bulb.

Lesson notes

What is an Electrical Circuit? An electrical circuit is a pathway that allows electricity to flow. Think of it like a road for electrons – tiny particles that carry electrical charge. Just like a road needs to be complete for a car to travel from one place to another, an electrical circuit needs to be complete for electricity to flow. If there's a break in the road (or circuit), the car (or electricity) can't get through.

Components of a Simple Electrical Circuit: A simple electrical circuit usually contains the following parts: Battery/Cell: This is the power source of the circuit. It provides the energy that pushes the electrons through the wires.

Batteries have two terminals: a positive (+) terminal and a negative (-) terminal. It’s like the petrol in your car providing the energy.

Wires: These are like the roads for the electrons. They are usually made of metal (often copper) because metals allow electricity to flow easily. We say they are good conductors of electricity.

Bulb/LED (Light Emitting Diode): This is the component that shows us that the electricity is flowing. The electricity flowing through the bulb makes it light up, providing light and sometimes heat. LEDs are more efficient and commonly used now.

Switch: This is like a gate on the road. It allows us to control whether the circuit is open (gate is closed, no flow) or closed (gate is open, electricity flows). When the switch is on, the circuit is closed and the bulb lights up. When the switch is off, the circuit is open and the bulb doesn't light up. Closed vs.

Open Circuits: Closed Circuit (Complete Circuit): This is when the pathway is complete, and electricity can flow from the battery, through the wires, bulb, and back to the battery. The bulb lights up in a closed circuit. Think of a tap being turned ON, water can flow freely.

Open Circuit (Incomplete Circuit): This is when there is a break in the pathway, and electricity cannot flow. This happens when the switch is turned off, or a wire is disconnected. The bulb will not light up. Think of a tap being turned OFF, the water flow stops.

How it Works: The Flow of Electricity Electrons flow from the negative (-) terminal of the battery, through the wire, to the bulb. The electricity passes through the filament (thin wire) inside the bulb, making it heat up and glow, which produces light. Then, the electrons flow back to the positive (+) terminal of the battery, completing the circuit.

Adding More Batteries: Adding more batteries to a circuit (connected in series, meaning positive to negative) increases the amount of energy pushing the electrons. This causes more electrons to flow through the bulb, making it brighter.

However, it's important to remember that too much electricity can damage the bulb or the other components, so always be careful.

Worked example

Scenario: You have a battery, a wire, and a bulb. You connect one end of the wire to the positive (+) terminal of the battery and the other end to one side of the bulb. You then connect another wire from the other side of the bulb to the negative (-) terminal of the battery.

Question: Will the bulb light up?

Answer: Yes, the bulb will light up. The circuit is closed, providing a complete pathway for the electrons to flow from the negative terminal of the battery, through the wire, through the bulb, through the other wire, and back to the positive terminal of the battery.

Scenario: You have the same components as above, but you disconnect one of the wires from the battery.

Question: Will the bulb light up?