13/12/2014
Hey engineers, let's get back to
the beginning for a second!! HOW VOLTAGE, CURRENT AND
RESISTANCE RELATE? An electric circuit is formed
when a conductive path is
created to allow free electrons
to continuously move. This
continuous movement of free
electrons through the conductors of a circuit is called
a current, and it is often
referred to in terms of “flow,”
just like the flow of a liquid
through a hollow pipe. The force motivating electrons
to “flow” in a circuit is called
voltage. Voltage is a specific
measure of potential energy
that is always relative between
two points. When we speak of a certain amount of voltage
being present in a circuit, we
are referring to the
measurement of how much
potential energy exists to move
electrons from one particular point in that circuit to another
particular point. Without
reference to two particular
points, the term “voltage” has
no meaning. Free electrons tend to move
through conductors with some
degree of friction, or opposition
to motion. This opposition to
motion is more properly called
resistance. The amount of current in a circuit depends on
the amount of voltage available
to motivate the electrons, and
also the amount of resistance in
the circuit to oppose electron
flow. Just like voltage, resistance is a quantity relative
between two points. For this reason, the quantities
of voltage and resistance are
often stated as being
“between” or “across” two
points in a circuit.