Electronics/Scratch pad

Parts list and theory

Voltage = potential between two charges. Defined as the derivative of the flux linkage:

$V(t)={\frac {d(Ni(t))}{dt}}$

Current = flow of electrons Defined as the rate of change of the charge:

$I(t)={\frac {dQ(t)}{dt}}$

There are 3 parameters in an electrical circuit:

Resistance =

$R={\frac {V}{I}}$

In a resistor voltage and current are in sync.

$V(t)=Ri(t)$

In capacitors voltage leads current. Capacitors are good as a low pass filter.

$V(t)={\frac {1}{C}}\int i(t)dt$

In inductors current leads voltage. Current equals the negative derivative of the voltage. Inductors are good as a high pass filter.

$V(t)=L{\frac {di(t)}{dt}}$

relationship between voltage and current

$P=VI$

in a circuit

in series voltage drops and current stays constant in parallel voltage stays constant and current divides according to the resistance

voltage stays constant in parallel and current drops in p

pizoelectric = a crystal under compression creates current

transformers

vacuum tube = electron emitter in a vacuum

integrated circuit a semiconductor doped with impurities

group 4 elements doped with group 3 and 5

electrons and holes

ground

applications

Resistors in series (Christmas lights, stove)

computer

3.5, 5, 12 Volts

lamp

monitor

power distribution (three phase power)

radio

modem

speaker

circuit design

bandgap

cmos

flip flop

computer parts

leakage current