technological world. what is electrical engineering? designing and developing objects which use...
TRANSCRIPT
What is electrical engineering?Designing and developing objects which use
electricity, electronics and electrical circuits is the work of electrical engineers.
Electrical engineering covers two main areas:ElectricityElectronics
Electricity & ElectronicsAll electrical appliances and electronic
devices depend on electrical circuits.The main difference between electricity &
electronics lies in the design of these electrical circuit components.
ElectricityMaterials used for electrical components are:
metals & alloys (especially copper) – these are known as conductors.
Electrical components have potentially powerful currents.
Electrical components have circuits of normal size.
ElectronicsMaterials used for electronic components
are: materials such as silicon – these are known as
semiconductors.Electronic components have low-intensity
currents.Electronic components have miniaturized
circuits.
Circuit DiagramsCircuit diagrams are symbolic
representations showing how different electrical components fit together to form a whole.
Circuit DiagramsConventional symbols are used to represent
the components which make up a circuit diagram.
Electrical/Electronic CircuitsAll circuits carry an electric current.The conventional current direction flows
from the POSITIVE terminal of the power supply to the NEGATIVE terminal.
Electrical/Electronic CircuitsOn the other hand, the electron flow occurs
in the opposite direction from the NEGATIVE terminal to the POSITIVE terminal.
Direct & Alternating CurrentElectric current can be described as direct or
alternating depending on the way electrons flow through the circuit.
Direct CurrentDirect current (DC) is an electrical current
in which the electrons move continuously in the SAME direction.Electrons move in only ONE direction.
A battery is one example of a source of direct current.