Thursday, January 19, 2017

Day One Notes

Two Types of Electricity

DC - Direct current 

AC - Alternating current

Electrons move from atom to atom

Charges rippling along a route (wire) a current

Conduction- you are passing electrons lower resistances

Insulator- stop electronic flow higher resistances

Electrons induce friction as they move along

All materials have resistance

It can be low to high depending on the atoms in the material

Ampere (Amps) - 1 amp is 6^18 electrons per second.

Volts- Are how many electrons can be supplied

electrons/second = voltage/resistance

Current or aperes or amps = voltage/resistance

I = V / R

R = V / I

V = I x R

Resistance is usually around .01 ohms, or even less

Do not connect power directly to the ground

There should always be a "load" on the circuit - Use to learn schematics and identify components

There are two types of circuits open and closed

Part One Components

Components used to constructively push electricity to do work

Two types of components through hole or surface mount technology

Both get soldered to attach to circuit

Through Hole- older technology

Legs that pass through board

Surface mount is mounted on the surface of the circuit board

Pole - Number of switch contacts

Throughs - Number of 

Open - off position contacts not conducting

Closed - on positions contacts conduction there may be several on positions

Normally open (NO) or Normally closed (NC)

Momentary - switch returns to its  normal position when released

latching - stays at last state until triggered again

first two stripes on resistors are a number like 0 1 and the third stripe is a multiplier

Resistors are measured in ohms using omega symbol

Kiloohm (Thousands) KOmega - 1k

Megaohm (millons) MOmega - 1M


A measurement that is how much electricity something can hold, also used to modify voltage

Farad = is a lot of energy

picoFarads (Trillionths) _ pF

nanoFarads (billionths) - mF

micro Farads (millionths) - uF (note the mu)

Capacitors can be polarized or non polar 

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