Page 134 - Science Class 06

light weight objects towards it such as v The cathode is an electrode where
straws, feathers, etc. In other words, we can reduc on occurs.

say that the amber is electrified The v The anode is an electrode where
electricity produced by rubbing upon one oxida on occurs.
another is called sta c electricity. The word
v A salt bridge is a chamber of electrolytes
“sta c” means sta onary or at rest. The
necessary to complete the circuit in a
charges that travel along wires is electricity
voltaic cell.
and the electricity that passes through the
wires is called electric current. v The oxida on and reduc on reac ons
are separated into compartments called
EELECTRIC CHARGES
half-cells.
Electric charge is nothing but the amount of
v The external circuit is used to conduct
energy or electrons that pass from one
the flow of electrons between the
body to another by different modes like
electrodes of the voltaic cell and usually
conduc on, induc on or other specific
includes a load.
methods. This is a basic electric charge
v The load is the part of the circuit which
defini on. There are two types of electric
charges. They are posi ve charges and u lises the flow of electrons to perform
nega ve charges. some func ons.

The nature of charge depends upon the
nature of the materials. For example, when

a glass rod is rubbed with a piece of silk the
Wire
rod acquires posi ve charge and the silk on Salt Bridge
equal nega ve charge.

Cell Anode
Cathode
A cell contains electricity in a stored form or
in the form of chemicals stored inside. A cell
has two ends marked by (+ve) sign and Flow of Electrons

(–ve) sign. The metal cap shows +ve
Voltaic Cell
terminal and metal disc is the nega ve
terminal. Cells can be of different types. The Dry Cell

The Voltaic Cell The dry cell does not contain any liquid
solu on and hence called dry cell. The cell
A voltaic cell is an electrochemical cell that
we use in our torch or toys are dry cells. Dry
uses a chemical reac on to produce
cells are, actually, the improved version of
electrical energy.
voltaic cell. This improvement was made by
The important parts of a voltaic cell are: a French scien st, George Lechalanche,

in 1866.

134 Science-6