Impedance of R/L/C18-2

Prof. Seewhy Lee

1. 교류회로의 임피던스와 위상차

2. 저항

3. 축전기

4. 인덕터

Agenda

1. 교류회로의 임피던스와

위상차

2. 저항

3. 축전기

4. 인덕터

Impedance & Phase Differ-ence

)sin(0 tV

)sin(0 tILoad

0

0

I

VZ Impedance

Large Impedance Small Current

Impedance of a Resis-tor

)sin(0 tV

R

)sin(0 tR

V

R

VI

)sin()sin( 00 tIt

R

V RZ

1

Ohm’s Law

Impedance of a Capacitor

)sin(0 tV

C

)sin(0 tCVVCq

)sin()cos( 00 tItCV CZ

1

)cos(0 tCVdt

dqI

Impedance of a Capacitor

)sin(0 tV

L

dt

dILtV )sin(0

)sin()cos( 00

tIt

L

V LZ

)cos(0 tL

VI

Capacitor vs. Inductor

CZC

1

Open for DC, Short for Infinte Freq.

LZL

Short for DC, Open for Infinte Freq.

Transduction of Sound & Image through Microphone & CCD

Modulation (Coding)

Oscillation Circuit

Transmission into Space

Receiving by Resonating Circuit

Demodulation (Decoding)

Transduction of Electrical Signal into Sound and Image

Telecommunication (1898-)

Thanks for your attention~!!

Prof. Seewhy Lee