1. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Batteries, Resistors, Capacitors,

2. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Current – Flow of electrons Voltage – Potential which makes current flow in a conductor Resistance (Impedance) – Property which impedes the flow of current

3. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Current – Flow of electrons Electron 1.6*10 -19 coulombs – Units: Ampere – Ampere = 1 coulomb/second 6.25 *10 18 electrons/second – Symbols & abbreviations Amps, I

4. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Voltage – Electromotive Force (EMF) – Potential difference between two points – Units: Volts – Makes current flow through conductors – Symbols & abbreviations V E

5. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Resistance – Property which impedes the flow of current – Units: Ohms – Ohm = 1 Volt / 1 Ampere – Symbol: Ω

6. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Resistors Circuit with Battery and Resistor Printed Circuit Sized Resistors Ohm’s Law: I = V/R 12V6Ω6Ω

7. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Two digits plus multiplier AB*10 C Yellow – Violet – Red 47*10 2 4700 Ω Brown – Black – Orange 10*10 3 10,000 Ω

8. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Tolerance Gold +/-5% Silver +/-10% None +/-20%

9. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Available in +/-5% Available in +/-10% Range of values is from 0.10 Ω To 22.0 x10 6 Ω

10. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Capacitors C= Charge/Voltage = Q/V Units: Farad Smooths changes in voltage

11. UNIVERSITY OF NEBRASKA – LINCOLN COLLEGE OF ENGINEERING Typical Resistor-Capacitor Circuit