Basic Analog Circuits || Lecture One

IN-CLASS NOTES:

 

Basic Analog Circuits

Dr. Eric Rosenthal

Office Hours Wednesday

Availability on Thursdays as well

 

SESSION ONE || http://www.basicanalogcircuits.com/Session_1.html

 

Electricity is invisible

 

Meters, Oscilloscopes let us see what electric signals are doing

Power supplies- generate electricity

Function Generators- complex waveforms

How to measure, how to generate/create it

 

Amperage = water current

 

Current is measured in amps (

If there is no pressure there is no current, it measures the electrons movement through the circuit

 

Voltage = water pressure

 

Switch = valve

When switch is closed, the voltage from the battery allows current to run through the circuit. Electricity will not

 

Work = Power

Measured in watts

V x C …ohm’s Law

 

Electrons = negativity

 

Conventionally, flows positive to negative (due to Ben Franklin’s incorrect explanation of electricity)

but in actuality it flows from negative to positive

 

Two types of circuits http://electronicsclub.info/seriesparallel.htm

  • Series, current is always the same in amperes or milliamperes
  • Parallel, voltage is always the same in wattage/watts but the current will increase as more connections occur (lights are turned on)

 

http://electronicsclub.info/voltage.htm

60 times/second

Alternating Current = ~

Direct Current =

 

Not as energy efficient to use the “conventional light bulb” with filament (Edison lightbulb)

More usage is leaning towards efficiency, (ex. LEDs)

 

Voltage adds & Current capability stays in the same, when batteries are in series

 

Electro magnetic force is actually what voltage is,

the movement of the electrons creates potential energy which is harnessed in the current

 

Resistor resists the flow of electrons, measured in ohms, limits the current

¼ (.25) watt resistors usually used for electronic circuits

made of carbon, which is a conductor of electricity, along with most metals. Carbon is a poor conductor & when impurities are added it makes it even less conductive.

It isn’t temporal, as it’s simply added pressure (ie: pressing your foot down on a water hose, makes it more difficult for the water to flow)

 

 

Ohm’s Law

https://learn.sparkfun.com/tutorials/voltage-current-resistance-and-ohms-law

 

Resistors

http://en.wikipedia.org/wiki/Electronic_color_code

 

Multimeter

http://www.sciencebuddies.org/science-fair-projects/multimeters-tutorial.shtml

  • you need to be on a voltage that is right above it, to maintain accuracy. When it is at “1” it is too low V– is used to measure DC voltage ranges

V~ used to measure AC voltages coming out of a wall, at 60Hz alternating current

anything other than 60 Hz, you must used an oscilloscope

anything above 48 volts, be very careful

When measuring your DC power supply, you switch to the Volts side

 

Capacitors

Leyden (Leiden) Jar http://en.wikipedia.org/wiki/Leyden_jar

Stores the charge of the electrons

Two pieces of metal rolled up around each other, separated by an insulator

http://www.saftbatteries.com/

 

 

REFERENCE || http://www.rapidtables.com/electric/Electric_units.htm

http://amasci.com/miscon/voltage.html

http://www.helcohi.com/sse/wires/hp.html

http://www.electricityforum.com/types-electricity.html [Current]

https://learn.sparkfun.com/tutorials/voltage-current-resistance-and-ohms-law

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