electric current 10th class
ELECTRIC CURRENT
ELECTRICITY
In Modern Society ,
Electricity has a important role. These form of energy is mainly used in homes,
hospitals, industries , factories, schools, lab, and so on.
Just as AIR Current and
WATER current , we can say that , flow of electric charge through a electric
conductor like metallic wire , there is an electric current in the conductor.
The torch illuminates
light , when its switched ON. The reason behind is due to
electric circuit.
The torch is with cell
or battery. The cell or battery carry flows of charge or an electric current.
When cells or battery is connected in proper order , then its provides the flow
of charge electric current . and when the switched ON , then they produce a
conducting link between the cells and the bulbs. And bulbs gets glows. And when
the switched is off , the circuit gets broken
and light gets turned off.
ELECTRIC
CIRCUIT:--
A Continuous and closed path of an electric currents called
electric circuit.
ELECTRIC CURRENT:--
Electric current is
expressed as the amount of charge is flowing through a particular area in unit
time.
We can also expressed
the electric current as the rate of flow of electric charges
Also electric current
is expressed the electric current is the
flow of positive charge (+ve) and the direction of flow of positive charge is
considered as the direction of the electric current.
Points to be noted
:-- In Electric circuit , the direction of
electric current is taken as opposite to the direction of the flow of electrons
which are negative charges (-ve) in
nature.
Formulae:-
If net charge Q flows
across any cross – section through a metallic conductor in a given time taken T
, then the current I flows through that cross- section is –
I =
Q/T
Here
,
I is the symbols of current flows through the any
mettalic conductor
Q is the symbols of net charge
T is the symbols of time taken to flow of charges in
metallic conductor
The SI units of
electric charge is coulomb (C)
The SI units of electric
current is denoted by a unit called AMPERE (A).
1 AMPERE :--
It is expressed by the
flow of 1 coulomb of charge per second.
1A =
1C/1S
Small quantities of
current -- milliampere
1mA =
10^-3 A
1 uA = 10^-6
A (microampere)
The instruments to be
used to measure the Electric current is AMMETER . the AMMETER is always
connected in series in a circuit.
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