Question

1. When does a torch bulb light up ?
2. Identify conductors and insulators from the following:
Eraser, Paper clip, Matchstick, Copper wire, Pencil lead, Polythene, thread, Iron nail
3. Mention one important use of insulators,
4. What are conductors ?
5. What are the two terminals of an electric cell ?​

Answer 1

Answer:

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Explanation:

Electricity to the bulb in a torch is provided by the electric cell. Electric cells are also used in alarm clocks, wristwatches, transistor radios, cameras and many other devices. Have you ever carefully looked at an electric cell? You might have noticed that it has a small metal cap on one side and a metal disc on the other side (Fig. 1). Did you notice a positive (+) sign and a negative (–) sign marked on the electric cell? The

Fig.1: An Electric Cell

metal cap is the positive terminal of the electric cell. The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.

An electric cell produces electricity from the chemicals stored inside it. When the chemicals in the electric cell are used up, the electric cell stops

Answer 2

Electric Conductors and Insulators

When it comes to the flow of electric current , all materials fall into two categories:

Conductors

Insulators

In all our activities we have used metal wires to make a circuit. Suppose we use a cotton thread instead of a metal wire to make a circuit. Do you think that the bulb will light up in such a circuit? What materials can be used in electric circuits so that the current can pass through them? Let us. find out. please mark me as brainliest