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CBSE Class 7 Science Chapter 3 Electricity: Circuits and their Components Worksheet - Free Download
True/False
(i) The human body is a good conductor of electricity.
(ii) An incandescent lamp will not glow if connected with the wrong terminals.
(iii) Circuit diagrams use symbols to show real components in a circuit.
(iv) A battery produces alternating current (AC).
(v) LEDs can work even if the positive and negative terminals are reversed.
Fill in the blanks.
(i) Longer line in the symbol for a cell represents its ____ terminal.
(ii) The combination of two or more cells is called a ____.
(iii) When current is switched ‘on’ in a room heater, it ____.
(iv) The safety device based on the heating effect of electric current is called a ____.
Answer the following Questions
Q3. What is electric current?
Q4. Write some uses of battery.
Q5. What is filament?
Q6. What are the uses of heating effect of electric current?
Q7. Name any two effects of electric current.
Q8. What is an electric circuit?
Q9. Explain the symbol of electric cell.
Q10. Why a fused bulb does not glow?
Q11. Sometimes the cells are placed side by side. Then how are the terminals of the cells connected?
Q12. What is a switch, and how does it control an electric circuit?
Q13. Explain the importance of circuit diagrams and list three symbols used.
Q14. Describe the difference between an incandescent lamp and an LED.
Q15. What are conductors and insulators? Give examples and their uses.
For Worksheet Solutions, go to Worksheet Solutions: Electricity: Circuits and their Components
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FAQs on CBSE Class 7 Science Chapter 3 Electricity: Circuits and their Components Worksheet - Free Download
| 1. What are the basic components of an electric circuit? |  |
Ans. The basic components of an electric circuit include a power source (like batteries), conductors (usually wires), a load (such as bulbs or motors), and a switch. The power source provides the electrical energy, conductors allow the flow of electricity, the load uses the electricity to perform work, and the switch controls the flow of current.
| 2. How does a circuit work? | |
Ans. A circuit works by providing a closed loop for electricity to flow. When the switch is closed, it completes the circuit, allowing electrons to move from the power source through the conductors to the load and back. This continuous flow of electric current enables devices to operate.
| 3. What is the difference between series and parallel circuits? | |
Ans. In a series circuit, all components are connected in a single path, so the current flows through each component one after another. If one component fails, the entire circuit stops working. In a parallel circuit, components are connected across multiple paths, allowing current to flow through several paths at once. If one component fails, the other components can still function.
| 4. Why is a switch important in an electric circuit? | |
Ans. A switch is important in an electric circuit because it allows users to control the flow of electricity. By opening (breaking) or closing (completing) the circuit, a switch can turn devices on or off safely, preventing electrical accidents and saving energy when devices are not in use.
| 5. What safety precautions should be taken when working with electric circuits? | |
Ans. When working with electric circuits, it is important to take several safety precautions: always turn off the power before making changes, use insulated tools, avoid working with wet hands or in wet conditions, and ensure that all connections are secure to prevent short circuits. Additionally, be aware of the voltage levels and use appropriate protective gear.
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