Learning about Electricity and its Importance - Electricity, Class 10 Science Video Lecture

electricity learning about electricity
and its importance
dear students can you imagine what would
happen to our lies without electricity
well it would be very hard to imagine
life without electricity electricity
occupies a very important role in a
modern day lives tricity is a convenient
and controllable form of energy for a
variety of users in homes hospitals
schools industries etc it is the
backbone of a modern day life have you
ever wondered what constitutes
electricity how does it flow in an
electric circuit what are the factors
that control or regulate the current
through the electric circuit in this
chapter let us understand and learn more
about electricity
you
we are aware that the flowing water
constitutes water current in Reverse
similarly when electric charge flows
through a conductor for example through
a metallic wire we say there is an
electric current in the conductor in
this case the metallic wire electric
circuit a continuous and closed path of
an electric current is called an
electric circuit now what happens if the
circuit is broken the current stops
flowing and the bulb does not glow
scientific definition of an electric
current electric current is expressed by
the amount of charge flowing through a
particular area in unit time in other
words it is the rate of flow of electric
charges if a net charge Q flows across
any cross-section of a conductor in time
T then the current I through the
cross-section is I is equal to Q upon T
the electric current is expressed by a
unit call ampere and an instrument which
measures electric current in a circuit
is known as a meter it is always
connected in series in a circuit through
which the current is to be measured
conventionally it is consider that the
current flows from positive to negative
in an electric circuit but the actual
factors current is a flow of electrons
and its direction is from negative to
positive
therefore the direction of electric
current is taken as opposite to the
direction of flow of electrons which are
negative charges potential difference
when a cell is connected to a conducting
circuit element the potential difference
sets the charges in motion in the
conductor and produces an electric
current we define the electric potential
difference between two points in an
electric circuit carrying some current
as you work done to move a unit charge
from one point to the other potential
difference V between two points is equal
to work done W upon charge Q the SI unit
of electric potential differences both V
the potential difference is measured by
voltmeter the voltmeter is always
connected in parallel across a points
between which the potential difference
is to be measured
that is all in this topic enjoy learning