AND PARALLEL CIRCUITS
reading this section you will be able to do
how a circuit is formed.
- List examples
of sources that the voltage for any electrical circuit can come
the differences between kinetic and potential energy.
what would happen if a resistor was not included in a circuit.
When we connect various components
together with wires, we create an electric circuit. The electrons
must have a voltage source to create their movement and, of course,
they need a path in which to travel. This path must be complete
from the EMF source, through the other components and then back
to the EMF source.
The voltage for any electric circuit
can come from many different sources. Some common examples are:
batteries, power plants, fuel cells.
||Flash Light Battery
When we plug an appliance
into a wall outlet, voltage and current are available to us. That
voltage is actually created in a power plant somewhere else and
then delivered to your house by the power wires that are on poles
or buried underground.
As a matter of fact,
since no current can flow unless there is a voltage source, we
also refer to these sources as current sources. In other words,
without the voltage source, there will be no current flowing.
This makes it a current source instead of a voltage source.
Batteries create voltage through a
chemical process. Power plants generate electricity from numerous
mechanical methods. Some burn coal or gas to create steam while
others use water flowing through a dam on a lake. There are also
nuclear-powered generating power plants. All of these power-generating
systems turn large turbines that turn the shaft on a generator.
All of these sources of electricity convert something called potential
energy to kinetic energy. The potential energy is stored in
the fuel, whether it is coal, gas, uranium, water in a dam, etc.
When we utilize these fuels to generate electricity, they become
We might say that potential energy
is waiting to be used while kinetic energy is being used.
In addition to the voltage source,
we need to have wires and other components to build an electric
circuit. Remember that copper wires are conductors since they
can easily conduct the flow of electrons. We may also use resistors
or other forms of loads to form a complete circuit. If we did
not include resistors in our circuit, there may be too much current
flowing to and from our voltage source and we could damage the
and various components connected together form a circuit.
plants and fuel cells are some examples of sources that the
voltage for any electrical circuit can come from.