Introduction of Electrical Energy

Electrical Energy is considered the backbone of modern civilization. Many applications could not be practically realized without this type of energy. Though electricity is often utilized after being transformed into other useful forms of energy, still it represents a clean, efficient and easily controlled way of transmitting energy from one place to another.
Electrical energy can be produced by different methods namely;
- Chemical reaction as in dry cells, batteries ……………..etc.
- Thermal energy as in thermo-couples.
- Solar energy as in solar cells.
- Mechanical energy as in Dynamos.
Most of electrical energy used in practice is being produced by the last method, since a reasonable amount of energy could be generated in less space at a moderate cost and in a rather efficient means. Electrical machine by definition is a bidirectional electro-mechanical energy converter, i.e. it can change mechanical energy into electrical one and hence acts as a GENERATOR or vice versa and thereby acts as a MOTOR.