Introduction of Electricity

The Importance And Need For Electricity In Daily Life.

All electrical appliances need electricity in order to function.

Example of electrical appliances :

a) heat energy.

b) sound energy.

c) light energy.

d) mechanical energy.

Electrical Energy Resources :

SEEBECK:

Heat when applied to the tip of two different metal wires will produce a voltage.

PHOTOELECTRIC:

When light is shone onto the surface of selenium, lithium, and semiconductor materials such as silicon, voltage will be generated.

ELECTROMOTIVE:

Current is induced when a  conductor is passed thought a magnetic field.

PIEZOELECTRICITY:

Different strength of pressure exerted on a crystal will generate voltage.

CHEMICAL REACTION:

A chemical reaction between zinc and copper in electrolyte will produce electric charge as in a battery cell.

ELECTROSTATIC FORCE:

Friction between two differenr materials will produce electrostatic force.

Generation, Transmision, And Distribution Of Electricity

There is two types of electricity generation which are:

a) Direct current generation:

Current that flows through a circuit in one direction is called directed current.

b) Alternating current generation:

Current that is constantly changing its direction of flow, with regards to the polarity of the current source, is called alternating current.

Alternating Current Generation.

there is some types of  power station:

a) Hydro Power Station:

b) Thermal Power Station:

c) Gas Power Station:

Electricity Transmission.

Electricity Distribution.

Consumer Circuit.

Consumer circuit purposes:

a) To ensure the safety of consumers from accidental electric shock.

b) To prevent fire due to electrical faults.

Scematic diagram for a single-phase supply curcuit.