# UNIT 4 ELECTRICAL ENERGY

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## Presentation Transcript

### 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

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