Gauge A. Write the letter of the correct answer on the space provided. 1. Some materials allow an electric current to flow through them. They are called electricity D. Radiators A. Conductors B. Convectors C. Insulators 2. Which of the following materials are good conductors of heat? A. Glass, cloth, paper B. Iron nail, silver, copper C. Aluminum, plastic, rubber D. Ceramic cups, disposable glass, silver D. Water 3. Which is a poor conductor of electricity? A. Copper B. Rubber C. Silver 4. Why is electrical wiring usually covered with a layer of plastic? A. To help electricity flow along the wire B. To make it look better C. To save electricity D. To make it safe 5. Why is aluminum used in making cooking pans? A. it is very strong B. it has a very high density. C. it is a good conductor of heat. D. it is a good conductor of electricity. 6. How can you protect yourself from the harmful effects of conductors? By using A. convectors B. insulators C. protractor D. radiators B. Identify the following objects if it is conductor or an insulator. 7. copper 8. book 9. plastic spoon 10. iron nails​