## Fluid System Design:

**(Electric Circuit Analysis) **

Department of Mechanical Engineering Chosun University

### Yang Jun Kang, Ph.D.

**engineering-and-computer-science/6-002-circuits-and-electronics-spring-2007 **
**“OCW.MIT.EDU”: MIT Open Courseware **

**1. Lumped parameter model **

**“ We could solve it with the hard way” **

**“Maxwell equations” **

_{Electric field D=}_{ε}

0**E **
**Magnetic field B=μ0H **

### dA

### n

### B

A B###

###

### ⋅

### =

### ∫

### φ

### dV

### q

V### ∫

### =

### ρ

### E

### D

###

### =

### ε

_{0}

###

**KVL**

**KCL**

**Volt **

**Current **

**2/31**

**1. Lumped parameter model **

**Quantitative analysis **

**1. Lumped parameter model **

**“Ohm’s law” **

**4/31**

**1. Lumped parameter model **

**“R” is a lumped element abstraction for the bulb **

**2. Node method **

**Demonstration **

**3. 1st _{ Order System }**

### ∫

idt### dt

### dv

### C

### i

### =

**15/31**

**4. 2nd _{ Order System }**

**) ( ) ( 0 0 0 0 0 t j t j**

_{24/31 }_{cV}

_{je}e V dt d c dt dv c i = = ω = ω ω 0 0