Class 8 Science Chapter 14 Notes- Chemical Effect Of Electric Current Notes
In this post, we will discuss Class 8 Science Chapter 14 notes pdf Chemical Effect Of Electric Current Notes. Class 8th science ch 14 notes help students in revision. In Chemical Effect Of Electric Current notes class 8, we will learn about Conductors, insulators and the chemical effect of electric current. You can also download the Chemical Effect Of Electric Current notes class 8 pdf for further study. NCERT notes for the Class 8 Science Chapter 14 are designed by our subject expert team.
In this Class 8th Science Ch 14 Notes pdf, we will learn about the Chemical Effect Of Electric Current Notes.
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Class 8 Science Chapter 14 notes Overview
Our elders always say not to touch an electrical appliance with wet hands you know why? because it is dangerous to touch an electrical appliance with wet hands. in this chapter, we study the chemical effect of electric current.
Electric Circuit
The path that a current takes in a closed-loop circuit is called an electric circuit. When the switch is closed the electricity is conducted. Although, when the switch is open then no conduction of electricity takes place.
Tester
The electric component checks the presence of electric current in a circuit called a tester. The tester contains an led bulb, which helps in indicate the presence of an electric current.
Conductors:– The materials which allow an electric current to pass through them are called good conductors of electricity. Metals such as copper and aluminium conduct electricity
Insulator:- The materials which do not allow an electric current to pass through them are called insulators or poor conductors of electricity. Rubber, plastic and wood do not conduct electricity.
Metals such as copper and aluminium conduct electricity whereas materials such as rubber, plastic and wood do not conduct electricity.
Do Liquids Conduct Electricity?
In the case of liquids, some liquids are good conductors of electricity while a few are bad conductors of electricity. The water obtained from sources such as pumps, wells, ponds and tap are not pure and contain several dissolved salts. Such water is a good conductor of electricity. While distilled water is free of salt and is a bad conductor of electricity. When we dissolved common salt in distilled water it makes distilled water a good conductor.
Most liquids that conduct electricity are solutions of acids, bases and salts.
Small amounts of mineral salts present naturally in water are beneficial for human health. However, these salts make water a good conductor. So, we should never handle electrical appliances with wet hands or while standing on a wet floor.
Chemical Effects of Electric Current
In Class VII, we have learnt some effects of electric current. Can you list these effects?
The passage of an electric current through a conducting solution causes chemical reactions. As a result, bubbles of a gas may be formed on the electrodes. Deposits of metal may be seen on electrodes. Changes in the colour of solutions may occur. The reaction would depend on what solution and electrodes are used. These are some of the chemical effects of the electric current.
Electroplating
Electroplating: The process of depositing a layer of any desired metal on another metallic object, by means of electricity, is called electroplating. Electroplating is an example of a chemical effect of current.
Electrode: It is the metallic rod/conductor through which electricity enters or leaves an electrolyte.
Applications of Electroplating: Electroplating is a very useful process. It is widely used for coating metal objects with a thin layer of a different metal. For example, chromium plating is done on many objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims and many others.
What We Learn Class 8 Science Chapter 14 Notes
In Class 8th Science Ch 14 Notes pdf / Chemical Effect Of Electric Current Notes
- Some liquids are good conductors of electricity and some are poor conductors.
- Most liquids that conduct electricity are solutions of acids, bases and salts.
- The passage of an electric current through a conducting liquid causes chemical reactions. The resulting effects are called the chemical effects of currents.
- The process of depositing a layer of any desired metal on another material, by means of electricity, is called electroplating.
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