What is Electricity?
Electricity is the result of the presence and flow of
It is a secondary energy source which means that
we get it from the conversion of other sources of
energy, like coal, natural gas, oil, nuclear power and
other natural sources, which are called primary
In order to understand how
electric charge moves from one
atom to another, we need to know
something about atoms:
Everything in the universe is made of atoms
Atoms are so small that millions of them would fit
on the head of a pin.
There are other smaller particles than atoms,
which are inside of them.
Are made out by three basic small
Protons: carry a positive charge. (+)
Neutrons: carry a neutral or no charge.(0)
*Protons and Neutrons join together to form
the Nucleus (which is in the central part of the
Electrons: carry a negative charge, and
surrounds the nucleus.
How it works?
The electrons in the shells closest to
nucleus have a strong force of
Sometimes, the electrons in the outermost
shells do not. These electrons can be pushed out
of their orbits. Applying a force can make them
move from one atom to another. These moving
electrons are electricity.
One of the common uses of
series circuit :
is a circuit in which resistors are arranged in a
chain, so the current has only one path to take.
The current is the same through each resistor.
The total resistance of the circuit is found by
simply adding up the resistance values of the
For example: Christmas tree lights
A parallel circuit : is a circuit in which the
resistors are arranged with their heads
connected together, and their tails connected
together. The current in a parallel circuit
breaks up, with some flowing along each
parallel branch and re-combining when the
branches meet again. The voltage across each
resistor in parallel is the same.