How can you catch electricity?
Electricity
is a form of energy that we cannot live without it. Sometimes it called the
unseen force as we cannot see, touch and smell or hear it.But on the other hand
we see the effect of electricity when the lamp give the light or when the motor
rotates …etc. and we can hear the effect of electricity when a fuse blow out
also we can smell the effect of electricity when some insulated wire are over
heated due to the excessive amount of current pass throw it so the insulation
is burned.
Theory of the electrical current flow:
We
have two theories that describe how the current flow throw any load,the first
one called conventional theory and the second called electrons theory, let us
know the difference:
Conventional theory:
It says
that the electrical current flow throw any load from the positive to the
negative side of the power supply as it see that the free electrons flow from
the high potential side to the low potential side. This theory is usually used
for automotive systems.
Electrons theory:
It
says that the electrical current flow throw any load from the negative to the
positive side of the power supply as it see that the free electrons flow from
the high number of electrons side to the low number of electrons side to
balance the charges inside the power supply. This theory is usually used for electronics
systems.
About
the effect of the current direction, in fact some devices like diode are
affected by the current direction and other devices don't affect as resistive
loads.
Electrons flow and electrical current formation:
There
are a number of electrons in the inner and outer orbit of the atom, the
electrons present in the outer orbit are away from the nucleus and less
attracted to it, so we call them "free electrons" as the are so easy
to move . Electrical current is formed when these free electrons move from one
atom to the next one. These electrons become free due to a certain force like
heat, friction, pressure, chemical reaction or magnetic action.
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