112 Basic Electronics Formula Sheet

Formulas for Basic Electronics (Secondary) Resistor Colors

Degrees deg=rad∗

Radians

180  

186,000 mi/sec or 1e8 m/sec

c

T=1/f

Period

f = 1 / T

Frequency

3

 = f/c

Wavelength

Yellow

4

f = /c

Frequency

Green

5

Blue

6

Violet

7

Gray

8

White

9

Gold

5%

Silver

10%

None

20%

Black

0

Brown

1

Red

2

Orange

VT

V1 + V2 + ... + Vn

IT

I 1 = I2 = In

RT

R1 + R2 + ... + RN

PT

P1 + P2 + ... + Pn

ZT

Z1 + Z2 + ... + Zn

 R  X −X 2

Z

L

C

2

rad=deg∗   180 Resistors

Sine Wave Conversions Pk-Pk x

Pk x

RMS x

AVG x

Pk -Pk =

1

2

2.828

3.14

Pk =

0.5

1

1.414

1.57

RMS =

0.3535

0.707

1

1.11

AVG =

0.3185

0.637

0.9

1

fres =

---

f=

---

Transformers : Turns / Voltage / Current Ratios N p Is = Ns I p

Is V p = Ip Vs

Inductors

Capacitors

1 2 ∗ [LC] XL 2 ∗L

1 2 ∗C∗ X C

X=

---

2 ∗f ∗L

1 2 ∗f ∗C

Z=

R 0

XL 90

XC 90

t=

Np V p = Ns V s

Series Circuits

L= C=

---

L/R

RC

---

XL 2f

---

---

1 2  f XC

---

Parallel Circuits VT

V1 = V2 = Vn

IT

I1 + I2 + ... + In All Circuits

2 Branch

RT



1 1 1  ...  R1 R2 Rn

R1 R2 R 1R2

ZT



1 1 1 −1  ...  Z1 Z2 Zn

Z1 Z2 Z 1 Z 2

−1

PT

P1 + P2 + ... + Pn

Z

E T  R X L −X C 2 = I T R 2X L− X C  2

Equal R R1 Rn Z1 Zn