Physics Chemical Effects of Current Part 5 (Testers) Class 8 VIII

TL;DR

Learn how to determine if a substance is a good or poor conductor of electricity using a conductivity tester.

Transcript

hello friends this video on chemical effects of current part 5 is brought to you by exam for calm no more fear from exam so now the question is how do I know if a substance is a good conductor of electricity or a poor conductor like in the previous slide I gave you a few examples of a good conductor and a poor conductor for example I said that the ... Read More

Key Insights

• 👋 A conductivity tester helps determine if a substance is a good or poor conductor of electricity.
• 👷 Homemade conductivity testers can be constructed using basic materials like a bulb, battery, and switch.
• ❓ Multimeters can also be used as conductivity testers.
• 💐 By observing if a bulb glows or if a current flows in a multimeter, the conductivity of a substance can be determined.

Questions & Answers

Q: What is the purpose of a conductivity tester?

A conductivity tester is used to determine if a substance is a good or poor conductor of electricity by completing a circuit and observing if a bulb or multimeter displays a current flow.

Q: How can a homemade conductivity tester be constructed?

A simple conductivity tester can be made using a bulb, battery, switch, and the substance being tested. If the bulb glows when the circuit is completed, the substance is a good conductor; if it does not, it is a poor conductor.

Q: Can a multimeter be used as a conductivity tester?

Yes, a multimeter can act as a conductivity tester by connecting its two leads to the substance being tested. If the multimeter displays a current flow, the substance is a good conductor; if not, it is a poor conductor.

Q: How can the functionality of a conductivity tester be tested?

To test the functionality of a conductivity tester, the two ends of the tester can be connected without any substance. If the bulb or multimeter displays a current flow, the tester is working fine.

Summary & Key Takeaways

• A tester is used to test the conductivity of substances, whether solid or liquid, to determine if they are good or poor conductors of electricity.

• A simple homemade tester can be created using a bulb, battery, and switch, where the bulb will glow if the substance is a good conductor and not glow if it is a poor conductor.

• Multimeters can also be used as testers, with their two leads connected to the substance being tested.