1) Sources of Alternating Current:
Hydro Electric Power
2) Thermo Electric Power
, 3) Nuclear Power
2) Sources of Direct Current :
1) Dry Cells
2) Lead- Acid Battery
2) Nickel Cadmium Cell
3) DC generator
3) Use of Alternating Current:-
AC is used for driving high power electrical instruments like motors, furnaces, heater, fan, mixer, grinder, refrigerator, Air Conditioner etc. It is used for domestic and industrial purposes.
4) Use of Direct Current:
All Electronic instruments like radio, Television, Music sytem, mobile phone , laptop computers, Desktop Computers , tablet computers etc work in Direct Current.
5) Static Electricity:
Static electricity is an imbalance of electric charges within or on the surface of a material. The charge remains until it is able to move away by means of an electric current or electrical discharge. Static electricity is named in contrast with current electricity, which flows through wires or other conductors and transmits energy.
A static electric charge can be created whenever two surfaces contact and separate, and at least one of the surfaces has a high resistance to electric current (and is therefore an electrical insulator). The effects of static electricity are familiar to most people because people can feel, hear, and even see the spark as the excess charge is neutralized when brought close to a large electrical conductor (for example, a path to ground), or a region with an excess charge of the opposite polarity (positive or negative). The familiar phenomenon of a static shock–more specifically, an electrostatic discharge–is caused by the neutralization of charge.
Dynamic electricity is the flow of electric charges through a conductor; in other words, an electric current.
Hydro Electric Power: Electricity is generated using the energy of stored water in reservoirs. Reservoirs are constructed in high altitude are, water is allowed to flow with high pressure down through pipes called Penstock, where turbines are fixed , which rotate the armatures of generators and produce electricity.
Thermal Electric Power:- Electricity is produced from fossil fuels like Coal, Diesel, Petrol, lignite, Naphthalene etc. The fuels are burnt and the heat is used to generate high pressure steam. The pressurized steam flow is used for rotating the turbines and generating electricity.
Nuclear Power : Energy liberated from Nuclear fission is used for generating the high pressure steam, which is used for rotating the turbines of electric gernerator.