Chpater 14 => Chemical Effects Of Electric Current of class 8 (Definitions)

       

1)ELECTRIC CURRENT -Flow of electrons is called Electric Current.

2)ELECTROPLATING-The process of depositing a layer of any desired metal on another material by means of electricity is called ELECTROPLATING.

3)CHEMICAL EFFECTS OF CURRENTS-The passage of an electric current through a conducting liquid causes chemical reactions. The resulting effects are called CHEMICAL EFFECTS OF CURRENTS.

4)GOOD CONDUCTOR-Which conduct the electricity and which allows the electricity to flow throw it is called GOOD CONDUCTOR.

5) INSULATOR-Which do not conduct electricity and which don’t allow the electricity to flow through it is called INSULATOR.

6)ELECTRODES-The metal rods or plates through which electric current enters or leaves the conducting solution is called an ELECTRODES.

7)CATHODE (positive terminal) -CATHODE is electrode connected to negative terminal of a battery.

8)ANODE (negative terminal) - ANODE is electrode connected to the positive terminal of a battery.

9)LED – LED’s refer to ‘Light Emitting Diodes’. They can detect even a weak current.

10) BAD/POOR CONDUCTOR- Some substances allows electric current to pass through them but in very little amount .Therefore, such substances are called BAD/POOR CONDUCTOR of electricity.

11) BATTERY- A container consisting one or more cells, in which chemical energy is converted into electricity and is used as a source of power.

12) CURRENT- The time rate of flow of electric charge, in the direction that a positive moving charge would take and having magnitude equal to the quantity of charge per unit time: measured in ampere is called CURRENT.

13)  AMPERE- AMPERE is a unit of electric current equal to a flow of one coulomb per second.