In this Class 7 Science Curiosity Chapter 3 Electricity Circuits and their Components, we will explore all about electrical circuits. We will learn what it is, how it flows in a circuit, and the various components that make up an electric circuit, such as cells, batteries, bulbs, wires, and switches. We will also learn how to make simple circuits and identify materials that allow electricity to pass through them.
Electricity plays a very important role in our daily lives. From lighting up our homes to running appliances like fans, televisions, and computers, we depend on electricity for comfort, work, and communication. But have you ever wondered how a small battery lights up a bulb in a torch? Or how a switch can turn a light on or off instantly?
By the end of this chapter, you’ll be able to create your own circuits, understand how electric devices work, and use electricity safely and responsibly.
Class 7 Science Curiosity Chapter 3 Worksheet
Get ready to ask questions, try out experiments, and let your curiosity lead the way. Download our Science Class 7 Curiosity Chapter 3 worksheet for extra practice and better understanding of the chapter.
Chapter 3 Electricity Circuits and their Components Notes
What is Electricity?
Electricity is a form of energy used to power devices like bulbs, fans, TVs, etc.
It flows through a closed circuit and requires a source (battery or cell).
Electric Cell
A source of electricity.
Has two terminals: positive (+) and negative (−).
Chemical energy inside it gets converted to electrical energy.
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Class 7 Science Worksheet Curiosity
Class 7th Science NCERT Solutions Curiosity
Battery
A group of two or more cells connected together.
Used in devices needing more power.
Electric Circuit
A complete path for current to flow.
Includes a cell, conducting wire, and an electrical component (like a bulb).
Must be closed for electricity to flow.
Electric Bulb
Glows when electricity passes through.
Contains a filament (usually tungsten) that heats up and emits light.
Glass cover prevents the filament from being damaged.
Switch
A device that opens or closes the circuit.
Closed switch → Circuit is complete → Current flows.
Open switch → Circuit is broken → No current flows.
Conductors and Insulators
Conductors: Allow electric current to pass (e.g., copper, aluminum).
Insulators: Do not allow current (e.g., rubber, plastic).
Class 7 Science Curiosity Chapter 3 Question – Answer
Q1. What is an electric circuit?
Ans: An electric circuit is a complete path through which electric current flows.
Q2. Name two good conductors and two insulators.
Ans: Conductors: Copper, Aluminum. Insulators: Plastic, Wood.
Q3. What is the function of a switch in a circuit?
Ans: A switch opens or closes a circuit to start or stop the flow of electricity.
Q4. Explain the working of an electric bulb.
Ans: An electric bulb works when current passes through its filament, heating it up. The filament becomes hot enough to glow and emit light. The bulb’s glass covering protects the filament from air.
Class 7 Science Curiosity Chapter 1 Fill in the blanks
- An electric bulb has a thin wire called a ________.
- A switch is used to ________ a circuit.
- Copper is a good ________ of electricity.
- A circuit must be ________ for the current to flow.
- A battery is a combination on of two or more ________.