When a PVC pipe gets rubbed with a woolen cloth, it acquires electrostatic negative charge. The same type of charge is acquired by the packing string (that looks like a jelly fish), when it is rubbed with the woolen cloth. Therefore the same charge on both these bodies leads to repulsion which is a feast to observe.
Electricity from lightning
As the lightning occurs, it can be captured using a three–foot bolts arranged in an order on a plane ground. Each of these three–foot bolt generates enough electricity to illuminate a 60–watt light bulb for 20 minutes. But a full–scale system could power 30,000 homes for a day with just one lightning bolt. It is believed that the average Midwest thunderstorm releases enough electrical energy to power the entire U.S. for 20 minutes. Who knows what the potential is for the harvesting of lightning fields and arrays of bolt conductors?
Electric charges are one of the
fundamental building blocks of atoms. The atom′s massive central nucleus
is positively charged, while lighter, negatively charged electrons
orbit the nucleus. An object is negatively charged if its atoms possess
either an excess of electrons or a deficit of electrons. The French
physicist Charles Coulomb deduced that charge manifests itself in two
opposing forms. Coulomb′s law describes forces between electric charges
as: Like charges repel each other and opposite charges attract. The
force between the charges is directly proportional to the product of the
charges and inversely proportional to the distance between them. The
study of electric fields created by stationary charges is called
Electric current is a movement or flow of electrically charged
particles, the intensity of which is usually measured in amperes. The
process by which electric current passes through a material is termed
electrical conduction. Its nature varies with that of the charged
particles and the material through which they are travelling. While the
particles themselves can move quite slowly, sometimes with an average
drift velocity only fractions of a millimeter per second, the electric
field that drives them itself propagates at close to the speed of light,
enabling electrical signals to pass rapidly along wires. Current is
often described as being either direct current (DC) or alternating
current (AC) depending on how the current varies in time.
The electric potential at any point is defined as the energy required
to bring a unit test charge from an infinite distance slowly to that
point. It is usually measured in volts, and one volt is the potential
for which one joule of work must be expended to bring a charge of one
coulomb from infinity. An electric circuit is an interconnection of
electric components such that electric charge is made to flow along a
closed path (a circuit), usually to perform some useful task. The
components in an electric circuit can take many forms, which can include
elements such as resistors, capacitors, switches, transformers and
electronics. Ohm′s law is a basic law of circuit theory, stating that
the current passing through a resistance is directly proportional to the
potential difference across it.
Electrical power is highly versatile as a means of providing energy.
Hence it finds use in a wide range of applications which include
transport, heating, lighting, communications, and computation.
Electrical power is usually generated by electro–mechanical generators
driven by steam produced from fossil fuel combustion, or the heat
released from nuclear reactions; or from other sources such as kinetic
energy extracted from wind or flowing water. Environmental concerns with
electricity generation have led to an increased focus on generation
from renewable sources, in particular from wind, solar and hydropower.