Introduction to Electrical Computer Engineering Circuit Elements Dr

Introduction to Electrical & Computer Engineering Circuit Elements Dr. Cynthia Furse University of Utah 1

Circuit Elements (2) • Voltage & Current Sources – Dependent / Independent – Ideal / Non-Ideal – i-v curves • Open , Short Circuits • Switches – Wiring Three-Way switches 2

Ideal Voltage and Current Sources is vs is + - 3

Non-Ideal Voltage & Current Sources I Rs vs + - is Rs - 4

Internal Resistance Energizer Tech Bulletin Battery Internal Resistance ver 1. 1. 0, Dec 05 http: //data. energizer. com/PDFs/Battery. IR. pdf 5

How does this affect you? is Rs vs + - Rload = 1Ω 6

This is (one reason) WHY our batteries went dead so fast in Antarctica! 7

I-V Curves used for diagnosis, I design, etc. Current (I) R=0 R=1 kΩ 1 m. A 0. 5 m. A R=2 kΩ V R R= ∞ 1 V Voltage (V) V=IR 8

I-V Curves for LED (Vf is where light turns on) http: //www. electronics-tutorials. ws/diode_8. html 9

Open Circuit R = ∞ Short Circuit R = 0 I=∞ http: //completeelectrical. biz/electricity-101 -types-of-circuits/ 10

Fuse / Circuit Breaker I≠ ∞ http: //homerepair. answers. com/electrical/online-diagrams-of-residential-electrical-power 11 panels

Switches Single Pole Single Throw (SPST) Single Pole Double Throw (SPDT) And more… 12

Three-Way Light Switch Wiring 13

Conclusion Circuit Elements • Voltage & Current Sources – Dependent / Independent – Ideal / Non-Ideal – i-v curves • Open , Short Circuits • Switches – Wiring Three-Way switches 14

Sunflowers & Thunderheads Blackhawk Trail Payson Canyon, Utah 15