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# 1. Circuit Terminology - PowerPoint PPT Presentation

1. Circuit Terminology. CIRCUITS by Ulaby & Maharbiz. Overview. Chapter 1: Circuit Terminology. Electronics Devices – active vs. passive Circuits Systems. Cell-Phone Architecture. Units, Multiples, Notation. Tech Brief 1: Micro- and Nanotechnology.

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1. Circuit Terminology

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## 1. Circuit Terminology

CIRCUITS by Ulaby & Maharbiz

### Chapter 1: Circuit Terminology

• Electronics

• Devices – active vs. passive

• Circuits

• Systems

### Charge & Current

• Unit of charge = coulomb

### Electron Drift

Response time = 0.2 microsecond

Actual travel time = 10 days!!

### Example 1-1: Charge Transfer

• Given:

Solution:

Determine: (a) q(t)

(b)

(b)

### Reference/Ground

• Choose reference point for potential

• Assign potential at reference = 0, called ground

• Now all potentials are relative to ground terminal

### Measuring Voltage & Current

• Voltmeter: measures voltage without drawing current

• Ammeter: measures current without dropping voltage

### Open Circuit & Short Circuit

• Open circuit: no path for current flow (R = )

• Short circuit: no voltage drop (R = 0)

### Power

Rate of expending or absorbing energy

Energy conservation

Units: watts

One watt = power rate of one joule of work per second. 1 W = 1 A x 1 V

### Example 1-4: Energy Consumption

• Given:Resistor consuming 20 W before switch turned off at t = 0.

Also

• Determine: Total energy consumed by resistor after t = 0.

• Solution:

(before t = 0)

### I-V for Sources

• Current/voltage fixed for independent sources

• What does a non-ideal source look like?

• Dependent sources vary with reference voltage/current

• What are units for slope?

• Given:

Source is CCVS

Determine:

Solution:

### Tech Brief 2: Moore’s Law

• Challenges to Continuation of Moore’s Law

• Heat dissipation

• Size (approaching atomic dimensions)