UNIT 4 ELECTRICAL ENERGY

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ELECTRICAL ENERGYELECTRIC CIRCUIT : 

ELECTRICAL ENERGYELECTRIC CIRCUIT Prepared by: Trần Thị Thu Hòa Nguyễn Thị Ngọc Mai Nguyễn Diệu Ngọc 13.10.2009

OBJECTIVE : 

OBJECTIVE Give common knowledge about: Energy Electrical energy Some kinds of electric circuits 13.10.2009

MAIN POINTS : 

MAIN POINTS ENERGY ELECTRICAL ENERGY ELECTRIC CIRCUIT 13.10.2009

ENERGY : 

ENERGY Energy: the capacity to do work (or produce heat). Kinetic energy: the energy of motion. Potential energy: the energy of position; stored energy. 13.10.2009

Kinetic energy : 

Kinetic energy Thermal energy: submicroscopic particles in motion. Mechanical energy: macroscopic objects in motion. Electrical energy: movement of electrons through a conductor. Sound energy: compression/expansion of spaces between molecules. 13.10.2009

Potential energy : 

Potential energy Chemical potential energy: position of electrons relative to atomic nuclei in bound atoms. Gravitational energy: position of an object in a gravitational field. Electrostatic energy: relative position of charged particles. 13.10.2009

Principle of conservation of energy : 

Principle of conservation of energy Wk + Wp = W = constant 13.10.2009

Slide 8: 

13.10.2009

MAIN POINTS : 

MAIN POINTS ENERGY ELECTRICAL ENERGY ELECTRIC CIRCUIT 13.10.2009

ELECTRICAL ENERGY : 

ELECTRICAL ENERGY Electrical Energy - The energy associated with electric charges and their movements Electric Power - The amount of energy produced per second. The power produced by an electric current. 13.10.2009

Electrical energy and electric power : 

Electrical energy and electric power Electrical energy - potential energy? Definitions of electric power. 13.10.2009

Where electrical power’s transmission exists : 

Where electrical power’s transmission exists Electric circuits or networks. P = VI I: current (A) V: difference of potential (V) P: power (W) 13.10.2009

Effect of an electric current : 

Effect of an electric current Production of heat P = VI Ohm’s law: V = RI P = RI2 Joule’s law 13.10.2009

MAIN POINTS : 

MAIN POINTS ENERGY ELECTRICAL ENERGY ELECTRIC CIRCUIT 13.10.2009

KINDS OF CIRCUITS : 

KINDS OF CIRCUITS SERIES PARALLEL 13.10.2009 Req = R1 + R2 + R3 1 / Req = 1 / R1 + 1 / R2 + 1 / R3 + ...

Kirchhoff's current law : 

Kirchhoff's current law 13.10.2009 i1 + i4 = i2 + i3

Kirchhoff's voltage law : 

Kirchhoff's voltage law 13.10.2009 v1 + v2 + v3 + v4 = 0

MAIN POINTS : 

MAIN POINTS ENERGY ELECTRICAL ENERGY ELECTRIC CIRCUIT 13.10.2009

Thank you for listening! : 

Thank you for listening! 13.10.2009

REFERENCE : 

REFERENCE GLENBROOK.K12.IL.US EDHELPER.COM HYPERPHYSIC.PHY-ARTR.GSU.EDU ACTEWAGL.COM.AU 13.10.2009