Class 7 Science — Chapter 3: Electricity: Circuits and their Components

What you'll learn

• ▸The Electric Cell and its Terminals
• ▸What is a Battery?
• ▸Components of an Electric Lamp
• ▸The Electric Circuit
• ▸Everyday Uses of Electricity
• ▸Safety with Electricity

Chapter Summary

--- PAGE 1 --- 3 Electricity: Circuits and their Components Nihal and his classmates were excited for their school trip to the Bhakra Nangal Dam. There they would visit the hydroelectric power house where the force of falling water was used to generate electricity. They also looked forward to the free 13 kilometre- train ride from Nangal in Punjab to Bhakra in Himachal Pradesh, along the beautiful Sutlej river and through the Shivalik hills. Prior to the trip, Nihal and his classmates were given a group assignment to prepare a presentation on the uses of electricity. They began by looking around their houses, then their school, followed by their neighbourhood, their city, and finally they searched the internet. To their astonishment, their list kept growing. They decided to organise the uses under different headings. 0777CH03 Cooking Electric kettle, mixer grinder, toaster, oven, microwave, Lighting Homes, offices, streets, markets, factories, Transportation Train, bus, car, scoo…

Practice Questions from this Chapter

Tap "Get Solution" on any question to ask our AI tutor.

1. Explain how a switch works. Get Solution →
2. Build a simple electric circuit. Get Solution →
3. Compare different electricity sources. Get Solution →
4. What is the small protruding metal cap on an electric cell called? Get Solution →
5. What is a combination of two or more electric cells connected together called? Get Solution →
6. What is the thin wire inside an incandescent lamp that glows to produce light? Get Solution →
7. In a Light Emitting Diode (LED), which wire is typically attached to the positive terminal? Get Solution →
8. What provides a complete path for electric current to flow through a lamp, making it glow? Get Solution →

Did you know?

• 💡 Electric eels can generate enough electricity to power 10 light bulbs.
• 💡 The first electric light bulb could only last for about 13.5 hours.
• 💡 Your brain uses about 20 watts of electrical power, like a dim light bulb.
• 💡 Early batteries were made from alternating discs of copper and zinc.
• 💡 Lightning is a natural phenomenon of static electricity being discharged.

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