Ans: A circuit diagram is a simplified representation of an electrical circuit using symbols to depict various components.
CBSE Class 7 > Class 7 Notes > Science (Curiosity) - New NCERT > Very Short Question Answers: Electricity: Circuits and their Components
Class 7 Science Chapter 3 Very Short Question Answers - Electricity: Circuits and their Components
Q1: Circuit diagram is a simplified conventional pictorial representation of an_______________
Ans: Electrical circuit
Q2: A circuit diagram uses standard symbols for electric components. True/ False.
Ans: True.
Q3: Define electric circuit.
Ans: A closed path formed by connecting electrical components allows electric current to flow. This arrangement is known as an electric circuit.
Q4: What is a cell holder?
Ans: A compartment that holds two or more cells together to form a battery is called a cell holder.
Q5: The combination of two or more cells is called a __________________.
Ans: Battery
Q6: A circuit is said to be open circuit or complete when current flows through it. True/ False.
Ans: False
Q7: What is a battery?
Ans: A combination of two or more cells connected together is called a battery. It is formed by connecting the positive terminal of one cell to the negative terminal of another.
Q8: The symbol for a battery is
a. 
b. 
c. 
d. None of These
Ans: C
Q10: Draw the symbol for an electric bulb in an electric circuit.
Ans:
Symbol of an Electric bulb
Q9: What is a circuit diagram?
Q10: Why do we use copper wires in electrical circuits?
Ans: Copper is a good conductor of electricity, which allows the current to flow easily through the wires.
Q11: A Longer line in the symbol for a cell represents its ------- terminal.
Ans: Positive
Q12: What is an electric circuit?
Ans: Electric Circuit: The closed path in which electric current flows.
Q13: What happens when the current is switched 'on' in a room heater?
Ans: It becomes red hot and gives out heat.
Q14: Would any of the bulbs glow when the switch is in the 'OFF' position in a circuit?
Ans: No, the bulb will not glow when the switch is "OFF" because there is no closed circuit for current to flow.
Q15: What type of electricity is used in homes and industries?
Ans: Alternating Current (AC).
Q16: What happens if the filament in an incandescent lamp breaks?
Ans: The lamp stops glowing because the circuit is broken.
Q17: How does a torchlight produce light?
Ans: By passing current through a lamp powered by electric cells.
Q18: What is the purpose of using insulators in circuits?
Ans: To prevent electric shocks and ensure safety.
Q19: What material is used to make the body of most electric cells?
Ans: Metal.
Q20: What direction does current flow in a circuit?
Ans: From the positive terminal of the cell to the negative terminal.
The document Very Short Question Answers: Electricity: Circuits and their Components is a part of the Class 7 Course Science (Curiosity) Class 7 - New NCERT.
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FAQs on Very Short Question Answers: Electricity: Circuits and their Components
| 1. What are the main components of an electric circuit and how do they work together? |  |
Ans. An electric circuit consists of a power source (battery), conductors (wires), a load (bulb or device), and a switch. The power source provides electrical energy, wires allow current to flow, the load uses that energy, and the switch controls whether current flows. All components must be connected in a closed loop for the circuit to function and allow electricity to reach devices.
| 2. What's the difference between a series circuit and a parallel circuit in Class 7 science? | |
Ans. In a series circuit, components connect one after another in a single path, so current flows through each part sequentially. If one component fails, the entire circuit breaks. In a parallel circuit, components connect in separate branches, allowing current to split. Each branch operates independently, so one broken component doesn't affect others.
| 3. Why does my bulb go dim when I add more bulbs to the circuit? | |
Ans. When bulbs are added in series, total resistance increases, reducing current flow through each bulb. Lower current means less energy reaches every bulb, making them dimmer. This happens because the power source's voltage gets divided among more components. Adding bulbs in parallel prevents this dimming effect since each bulb gets its own current path.
| 4. How do I identify whether a switch is open or closed in an electric circuit diagram? | |
Ans. An open switch appears as a broken line or gap in the circuit diagram, indicating no current can flow-the circuit is incomplete. A closed switch shows a continuous, connected line, allowing current to pass through uninterrupted. The switch symbol resembles a small lever or line crossing the conductor, with its position showing whether electricity flows or stops.
| 5. What role does resistance play in controlling electricity in a simple circuit? | |
Ans. Resistance opposes electrical current flow, controlling how much electricity passes through a circuit. Higher resistance reduces current, while lower resistance allows more current. Devices like bulbs and heaters use resistance to convert electrical energy into light or heat. Controlling resistance helps regulate circuit brightness, temperature, and prevents damage from excessive current flow.
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