Question

1) What is the cause of conductivity in solids and liquids?

2) Why the bulb glows when electric current passes through it?

3) What all things should we remember while connecting LED to a circuit?

4) What is advantage of using LED over bulb in testing the electrical conductivity of Liquids?

5). Briefly explain the process of electrolysis with the help of an activity.

6). Explain how copper gets transferred from one electrode to other during electroplating. Write down the important points which should be remembered while electroplating.

7).For electroplating copper on an iron key, which terminal of the battery is connected to the iron key? Draw a neat and labelled diagram.

8). Which properties of chromium metal make it suitable for electroplating it on car bumpers, bath taps and bicycle hand bars, etc. made of iron?

Answer 1

Answer:

1) Electrical conductivity is the flow of electrons, which are negative particles of charge present in all atoms. In the three states (solid, liquid, and gas), the particles in solid states move the least whereas in a gaseous state they move the most.

2.) The filament of a electric bulb glowsbecause of the heating effect ofelectric current. As the current passesthrough the bulb it heats the filament which gives off light.

3.) For LED 'light bulb' format light sources, these are generally designed to be as cost effective as possible, but for safety, a fuse and an MOV are still necessary at the input.

4.)

Answer 2

Answer:

1) Electrical conductivity is the flow of electrons, which are negative particles of charge present in all atoms. In the three states (solid, liquid, and gas), the particles in solid states move the least whereas in a gaseous state they move the most.

2.) The filament of a electric bulb glows because of the heating effect of electric current. As the current passes through the bulb it heats the filament which gives off light.

3.) For LED 'light bulb' format light sources, these are generally designed to be as cost effective as possible, but for safety, a fuse and an MOV are still necessary at the input.

4) Because most of the liquid that conduct the electricity are solutions of acid, base and salt. Liquid are not such good conductor of electricity as metal. So, to glow the bulb in less electricity an LED bulb is required.