SAQ for Chapter 3 Electricity: Circuits and their Components Class 7 Science NCERT
Important Questions1
Q1: What is a torchlight?
Answer
A torchlight is a portable device that produces light, commonly used to see in the dark.
Torchlight
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2
Q2: What is the function of the electric cell in a torchlight?
Answer
The electric cell provides the energy needed to make the lamp glow by allowing current to flow from the positive to the negative terminal.
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3
Q3: How does an electric circuit work?
Answer
An electric circuit is a complete path that allows current to flow from a power source (like a cell) through a device (like a lamp) and back, making the device work.
Circuit
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4
Q4: What is the difference between an electric cell and a battery?
Answer
An electric cell is a single source of electrical energy, while a battery is a combination of two or more cells connected together to provide more energy.
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5
Q5: What is an incandescent lamp?
Answer
An incandescent lamp has a filament inside that glows when electric current passes through it, producing light.
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6
Q6: What is the function of a switch in a circuit?
Answer
A switch controls the flow of current by either completing (closing) or breaking (opening) the circuit.
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7
Q7: What is the purpose of using insulators in electrical circuits?
Answer
Insulators prevent the flow of electric current and are used to cover wires and make switches and plugs to ensure safety.
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Q8: What is a circuit diagram?
Answer
A circuit diagram is a drawing that uses standard symbols to represent the components of an electrical circuit.
Circuit Diagram
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9
Q9: What is the role of a filament in an incandescent lamp?
Answer
The filament inside the incandescent lamp glows when heated by the electric current, producing light.
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10
Q10: What are the types of electricity used in devices?
Answer
The two main types of electricity are Direct Current (DC), used in devices like torchlights and phones, and Alternating Current (AC), used for larger appliances.
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