A Comprehensive list of Electronic Formulas
A List of all formulas relating to Electronics
Guide
Electronic Formulas
Here is a comprehensive list of all of the key formulas involved in Electronics. The formulas are divided into sections in order of simplicity and importance to the more complex:
Voltage, Resistance and Current
The most elementary concepts are the most important to understand. These are all the formulas dealing with electrical conduction properties of materials.
Essential Basic Electronic Formulas
FORUMLA 
Attribute 
Explanation 
Variables 
Q = (Number of Electrons)/(6.25*10^18) 
Charge 
Charge is the basic unit of Energy used in electronics. Charge is means a material has either an excess of electrons or a deficiency of Electrons. 6.25*10^18 Electrons's worth of energy is 1 Coulumb's worth of Charge.

Q represents Charge.

V = W/Q 
Voltage 
Voltage is the amount of energy for each unit of Charge

V represents Volts. W represents Joules. Q represents Charge.

I = Q/t 
Current 
Current is the amount of Charge per second (t) that passes through a point in the circuit.

I represents Current. Q represents Charge. t represents Time in Seconds

G = 1/R 
Conductance 
Conductance is the invert of Resistance and represents how easy it is for electrons to flow.

G represents Siemens. R represents Resistance in Ohm.

A = d^2 
Crosssectional 
The crosssectional Area in a circular mils conductor is equal to the diameter in mils squared.

A represents Cross Sectional Area. d represents diamter in mils.

R = (p*l)/A 
Resistance 
Resistivity in (CM OHM Resistivity of Material per ft) times the length of the material divided by the CrossSectional Area

R represents Resistance p represents CM Ohm Resistance per foot. l represents the length of the material. A represents the Cross Sectional Area.

















Ohm's Law and Kirchoff's Law
Ohm's Law provides the link to work with Curent,Voltage and Resistance directy.
Ohm's Law Electronic Formulas
FORUMLA 
Attribute 
Explanation 
Variables 
I = V/R 
Current 

Q represents Charge.

V = I*R 
Voltage 

V represents Volts. W represents Joules. Q represents Charge.

R = V/I 
Resistance 

I represents Current. Q represents Charge. t represents Time in Seconds

P = W/t 
Power 

G represents Siemens. R represents Resistance in Ohm.

W = P*t 
Energy 

A represents Cross Sectional Area. d represents diamter in mils.

P = (I^2)*R 
Power 

R represents Resistance p represents CM Ohm Resistance per foot. l represents the length of the material. A represents the Cross Sectional Area.

P = (V^2)/R 
Power 


e = (P_out)/(P_In) 
Power Efficiency 


P_out= P_in  P_loss 
Output Power 






Resistance, Voltage and Power in Series circuits
Ohm's Law provides the link to work with Curent,Voltage and Resistance directy. Remember, CURRENT IS THE SAME IN ALL POINTS IN A CIRCUIT BRANCH IN SERIES.
Ohm's Law Electronic Formulas
FORUMLA 
Attribute 
Explanation 
Variables 
Rt = R1 + R2 + R3 + ... + Rn 
Total Series Resistance 
The total resistance in a series circuit is equal to the sum of the resistance of the parts that make up the series circuit.

Rt represents Total Resistance. R1 represents the Resistance of the 1st Resistor in the series. R2 represents the Resistance of the 2nd Resistor in the series. R3 represents the Resistance of the 3rd Resistor in the series. Rn represents the Resistance of the nth Resistor in the series.

Rt = n*R 
Total Resistance of n circuit in series 
The total resistance of N equalvalue resistors in series.

Rt represents Total Resistance. nR represents the number of equalvalue resistors in series.

Vs = V1 + V2 + V3 + ... + Vn 
Source Voltage 
The Source Voltage of a circuit in series is equal to the sum of all the voltage drop over each resistor in series. (Kirchhoff's Voltage Law)

Vs represents the Total Voltage Source supply. V1 represents the Voltage Drop across the 1st Resistor in series. V2 represents the Voltage Drop across the 2nd Resistor in series. V3 represents the Voltage Drop across the 3rd Resistor in series. Vn represents the Voltage Drop across the nth Resistor in series.

Vx = ((Rx)/(Rt))*Vs 
Voltage Drop 
The Voltage Drop across a resistor is proportional to the resistance of the invidual resistor over the the total resistance of the circuit. This is the VoltageDivider Formula.

Vx represents the Voltage Drop over a Resistor x. Rx represents the Resistance of Resistor x. Rt represents the Total Resistance of the circuit. Vs represents the total Voltage Source

Pt= P1 + P2+ P3 + ... + Pn 
Total Power 

Pt represents the Total Voltage Source supply. P1 represents the Power at the 1st Resistor in series. P2 represents the Power at the 2nd Resistor in series. P3 represents the Power at the 3rd Resistor in series. Pn represents the Power at the nth Resistor in series.





















Resistance, Current and Power in Parallel circuits
Ohm's Law provides the link to work with Curent,Voltage and Resistance directy. Remember, VOLTAGE IN A PARRELEL CIRCUIT IS THE SAME ACCROSS ALL BRANCHES.
Ohm's Law Electronic Formulas
FORUMLA 
Attribute 
Explanation 
Variables 
1/Rt = 1/R1 + 1/R2 + 1/R3+...+ 1/Rn
therefore
Rt=1/(1/R1 + 1/R2 + 1/R3 + ... + 1/Rn)

Total Parallel Resistance 
The total resistance in a parallel circuit is equal to reciprocal of the the sum of the reciprocal resistance of the parts that make up the parallel circuit.

Rt represents Total Resistance. R1 represents the Resistance of the 1st Resistor in the parallel. R2 represents the Resistance of the 2nd Resistor in the parallel. R3 represents the Resistance of the 3rd Resistor in the parallel. Rn represents the Resistance of the nth Resistor in the parallel.

Rt = R/n 
Total Parallel Resistance nequal value resistors in parallel. 
The total resistance of N equalvalue resistors in series is equal to the value of the resistor divided by the number of resistors.

Rt represents Total Resistance. nR represents the number of equalvalue resistors in parallel.

Rt = (R1 * R2) / (R1 + R2) 
Total Resistance for two resistors in parallel. 
The Source Voltage of a circuit in series is equal to the sum of all the voltage drop over each resistor in series. (Kirchhoff's Voltage Law)


I1 = ((R2)/(R1+R2))*It
I2 = ((R1)/(R1+R2))*It

Current in a twobranch Current Divider circuit. 
The Voltage Drop across a resistor is proportional to the resistance of the invidual resistor over the the total resistance of the circuit. This is the VoltageDivider Formula.


Ix = (Rt/Rx)*It 
Current in a general Current Divider circuit. 


Gt = G1 + G2 + G3 + ... + Gn 
Total Conductance in a Parallel circuit. 


Pt = P1 + P2 + P3 + ... + Pn 
Total Power in a Parallel circuit. 


Iin1 + Iin2 + Iin3 + .... + Iin(n) = Iout1 + Iout2 + Iout3 + ... + Iout(n) 
Kirchhoff's Law of Current in Parallel Brances 










 To be cotinued/updates as soon as possible