Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

Quick Electronic Formulas Cheat Sheet, Cheat Sheet of Electronics

Quick and useful cheat sheet with all the main Electronic Formulas

Typology: Cheat Sheet

2019/2020

Uploaded on 10/23/2020

eekbal
eekbal 🇺🇸

4.6

(30)

264 documents

1 / 2

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
E'IR '
P
I'PR P'I2R'EI 'E2
R
E'IZ 'P
Icos1'PZ
cos1
P'I2Zcos1'IE cos1'E2cos1
Z
pf '
Active
power
(
in
watts
)
Apparent power (in volt&amps)'
P
EIpf '
Z
Rtotal 'R1%R2'R3%...
Rt'
R
1
R
2
R1%R2
Rtotal '1
1
R1
%1
R2
%1
R3
%...
f'
1
2BLC ,or f'
159
.
2
(
LC L'1
4B2f2C,or L'25,330(
f2CC'1
4B2f2L,or C'25,330(
f2L
G'
1
R(for D&Ccircuit)G'
R
R2%X2(for A&Ccircuit)
XC'
1
2BfCC'
1
2BfXC
X
L'
2
B
fL
L'
X
L
2Bf
Z'R2%(XL&XC)2(for series circuit)Z'RX
R2%X2(for Rand Xin parallel)
Q'
X
L
Ror
X
C
R
2-7.1
ELECTRONIC FORMULAS
Ohm's Law Formulas for D-C Circuits.
Ohm's Law Formulas for A-C Circuits and Power Factor.
In the above formulas 1 is the angle of lead or lag between current and voltage and cos 1 = P/EI = power factor or pf.
Note: Active power is the "resistive" power and equals the equivalent heating effect on water.
Voltage/Current Phase Rule of Thumb Remember "ELI the ICE man"
ELI: Voltage (E) comes before (leads) current (I) in an inductor (L)
ICE: Current (I) comes before (leads) Voltage (E) in a capacitor (C)
Resistors in Series
Two Resistors in Parallel Resistors in Parallel, General Formula
Resonant Frequency Formulas *Where in the second formula f is in kHz and L and C are in microunits.
Conductance
Reactance Formulas
Impedance Formulas
Q or Figure of Merit
pf2

Partial preview of the text

Download Quick Electronic Formulas Cheat Sheet and more Cheat Sheet Electronics in PDF only on Docsity!

E ' IR ' P

I

' PR P ' I^2 R ' EI ' E^

2 R

E ' IZ ' P

I cos 1

' P Z

cos 1

P ' I^2 Z cos 1 ' IE cos 1 ' E^

(^2) cos 1 Z

pf ' Active^ power^ ( in^ watts ) Apparent power ( in volt & amps )

' P

EI

pf ' R Z

Rtotal ' R 1 % R 2 ' R 3 % ...

Rt '

R 1 R 2

R 1 % R 2

Rtotal ' 1 1 R 1

R 2

R 3

f ' 1 2 B LC

, or f ' 159.^2 ( LC

L ' 1 4 B^2 f^2 C

, or L ' 25,330( f^2 C

C ' 1 4 B^2 f^2 L

, or C ' 25,330( f^2 L

G ' 1

R

( for D & C circuit ) G^ '^

R

R^2 % X^2

( for A & C circuit )

XC ' 1

2 B f C

C ' 1

2 B f XC

XL ' 2 B fL (^) L '

XL

2 B f

Z ' R^2 %( XL & XC )^2 ( for series circuit ) Z^ '^

RX

R^2 % X^2

( for R and X in parallel )

Q '

XL

R

or

XC

R

2-7.

ELECTRONIC FORMULAS

Ohm's Law Formulas for D-C Circuits.

Ohm's Law Formulas for A-C Circuits and Power Factor.

In the above formulas 1 is the angle of lead or lag between current and voltage and cos 1 = P/EI = power factor or pf.

Note: Active power is the "resistive" power and equals the equivalent heating effect on water.

Voltage/Current Phase Rule of Thumb Remember "ELI the ICE man"

ELI: Voltage (E) comes before (leads) current (I) in an inductor (L) ICE: Current (I) comes before (leads) Voltage (E) in a capacitor (C)

Resistors in Series

Two Resistors in Parallel Resistors in Parallel, General Formula

Resonant Frequency Formulas *Where in the second formula f is in kHz and L and C are in microunits.

Conductance

Reactance Formulas

Impedance Formulas

Q or Figure of Merit

DC Blocked

DC Passes

High Freq Blocked

High Freq Passes

DC

Low Freq AC

High Freq

Inductor * Capacitor * Resister

Pass Block^ Attenuate

Attenuate * Attenuate * Attenuate

Block Pass Attenuate

* Attenuation varies as a function of the value of the each device and the frequency

"Cartoon" memory aid

Peak Effective Average TIME

Wye (Y) or Star Delta

2-7.

Frequency Response

Sinusoidal Voltages and Currents

Effective value = 0.707 x peak value [Also known as Root-Mean Square (RMS) value]

Half Cycle Average value = 0.637 x peak value

Peak value = 1.414 x effective value

à Effective value = 1.11 x average value

Three-phase AC Configurations (120E phase difference between each voltage) If the connection to a three phase AC configuration is miswired, switching any two of the phases will put it back in the proper sequence. Electric power for ships commonly uses the delta configuration, while commercial electronic and aircraft applications commonly use the wye configuration.

Color Code for House Wiring: PURPOSE: Color Code for Chassis Wiring: Black or red HOT Red White NEUTRAL (Return) White Green or bare GROUND Black

Color Code for Resistors: First and second band: Third band Fourth band (and third band # of zeros if not gold/silver) Multiplier Tolerance 0 Black 5 Green .1 Gold 5% Gold 1 Brown 6 Blue .01 Silver 10% Silver 2 Red 7 Violet 20% No color 3 Orange 8 Gray 4 Yellow 9 White

The third color band indicates number of zeros to be added after figures given by first two color bands. But if third color band is gold, multiply by 0.1 and if silver multiply by 0.01. Do not confuse with fourth color-band that indicates tolerance. Thus, a resistor marked blue-red-gold-gold has a resistance of 6.2 ohms and a 5% tolerance.