# Physics Electric Current & Circuits Part 3 (Electric Circuits) Class 7 VII | Summary and Q&A

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February 22, 2016
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LearnoHub - Class 11, 12
Physics Electric Current & Circuits Part 3 (Electric Circuits) Class 7 VII

## TL;DR

In an electric circuit, the bulb only glows when the circuit is complete. A circuit is a path for electrons to flow, and circuit diagrams use symbols to represent components.

## Key Insights

• 💐 In an electric circuit, the bulb glows when the circuit is complete and the electrons can flow.
• 👻 A circuit is an arrangement of components connected to each other, allowing for the flow of electric charges.
• 😒 Circuit diagrams use symbols to represent components, making it easier to understand and visualize complex circuits.
• 💐 Without a complete path, there is no current flowing through the circuit, causing the bulb to not glow.
• 👻 The concept of a complete circuit can be compared to a bridge that allows a cyclist to move across.
• 🆘 Experimenting with simple circuits can help understand the concept of a complete or incomplete circuit.
• 💻 Complex circuits exist in devices like refrigerators, televisions, and computers and can be represented using circuit diagrams.

## Transcript

Hello friends this video on electric current and its effects part three is brought to you by exam fear.com no more fear from exam so now let us talk about some more important things so everywhere till now I have been showing you a circuit where you see there is a switch there is a battery and there is a bulb as soon as the switch is on the bulb Clo... Read More

## Questions & Answers

### Q: Why does the bulb glow only when the circuit is complete?

The bulb glows when the circuit is complete because only then can the electrons flow through the circuit, creating a current. Without a complete path, there is no current flowing, and the bulb does not glow.

### Q: How do you define an electric circuit?

An electric circuit is an arrangement of components connected to each other, providing a path for electric charges to flow. It allows for the movement of electrons and the flow of current.

### Q: What happens when the circuit is incomplete?

When the circuit is incomplete, there is a break in the path for electrons to flow. As a result, the electrons cannot continue moving, and there is no current. Without current, the bulb does not glow.

### Q: Why are circuit diagrams used?

Circuit diagrams are used to represent complex circuits because they provide a more concise and uniform way of visualizing the components. By using symbols, circuit diagrams make it easier to understand the circuit's structure and connections.

## Summary & Key Takeaways

• When the switch is off, the circuit is incomplete and the bulb does not glow. When the switch is on, the circuit is complete, allowing electrons to flow and the bulb to glow.

• A circuit is an arrangement of components connected to each other, providing a path for electric charges to flow.

• Circuit diagrams use symbols to represent components in complex circuits, making it easier to understand and visualize the circuit.