online electronic calculator - Ohm's law and much more

Ohm's Law calculator

Online calculator for formulas used in electronic circuit design and electrical engineering.

Basic electric calculations:

Ohm's Law, Ohm's Law with power, DC power, AC real power, LC resonant frequency, Capacitor charging/discharging, Capacitive reactance, Capacitive current + reactive power, Capacitor energy, Capacitor Δ energy, RC discharging, Inductor square pulse, Inductive reactance, Inductive current + reactive power, Inductor energy, 2 parallel resistors, 3 parallel resistors, System bandwidth

Wire and winding calculations:

Diameter ↔ cross section ↔ AWG, Wire resistance, Wire weight, Current density, Wire R thermal drift

Calculate Ohm's Law: 12V, 300mΩ, A


Using Ohm's law, you can calculate the current knowing the voltage and resistance. Ohm's law can also calculate resistance knowing the voltage and current, and finally, calculate the voltage knowing the resistance and current. Works based on well known formulas:   V=R.I   R=V/I   I=V/R

Enter any 2 values, the 3rd one will be calculated:

Voltage: -0.1 +0.1 -1 +1 -10 +10 -100 +100
Resistance: -0.1 +0.1 -1 +1 -10 +10 -100 +100
Current: -0.1 +0.1 -1 +1 -10 +10 -100 +100
Output metric prefix:   Automatic    User-selected
 

Standard EIA Decade Values of resistors - decade 100 to 1000 mΩ

E6E12E24
100 mΩ
150 mΩ
220 mΩ
330 mΩ
470 mΩ
680 mΩ
100 mΩ, 120 mΩ
150 mΩ, 180 mΩ
220 mΩ, 270 mΩ
330 mΩ, 390 mΩ
470 mΩ, 560 mΩ
680 mΩ, 820 mΩ
100 mΩ, 110 mΩ, 120 mΩ, 130 mΩ
150 mΩ, 160 mΩ, 180 mΩ, 200 mΩ
220 mΩ, 240 mΩ, 270 mΩ, 300 mΩ
330 mΩ, 360 mΩ, 390 mΩ, 430 mΩ
470 mΩ, 510 mΩ, 560 mΩ, 620 mΩ
680 mΩ, 750 mΩ, 820 mΩ, 910 mΩ

Other resistance decades:

0.1 - 1 Ω, 1 - 10 Ω, 10 - 100 Ω, 100 - 1000 Ω, 1 - 10 kΩ, 10 - 100 kΩ, 100 - 1000 kΩ, 1 - 10 MΩ, 10 - 100 MΩ, 100 - 1000 MΩ,

Some common voltages:

Alkaline
Zinc-Carbon
NiMH, NiCd
rechargeable
Li-Ion
3.6V
Li-Ion
3.7V
LiFePO4
(LFP) 3.2V
Lead-acid
battery
Power
supply
Mains
voltage
1-cell: 1.5V
2-cell: 3V
3-cell: 4.5V
4-cell: 6V
5-cell: 7.5V
6-cell: 9V
7-cell: 10.5V
8-cell: 12V
9-cell: 13.5V
10-cell: 15V
11-cell: 16.5V
12-cell: 18V
1-cell: 1.2V
2-cell: 2.4V
3-cell: 3.6V
4-cell: 4.8V
5-cell: 6V
6-cell: 7.2V
7-cell: 8.4V
8-cell: 9.6V
9-cell: 10.8V
10-cell: 12V
11-cell: 13.2V
12-cell: 14.4V
1-cell: 3.6V
2-cell: 7.2V
3-cell: 10.8V
4-cell: 14.4V
5-cell: 18V
6-cell: 21.6V
7-cell: 25.2V
8-cell: 28.8V
9-cell: 32.4V
10-cell: 36V
11-cell: 39.6V
12-cell: 43.2V
1-cell: 3.7V
2-cell: 7.4V
3-cell: 11.1V
4-cell: 14.8V
5-cell: 18.5V
6-cell: 22.2V
7-cell: 25.9V
8-cell: 29.6V
9-cell: 33.3V
10-cell: 37V
11-cell: 40.7V
12-cell: 44.4V
1-cell: 3.2V
2-cell: 6.4V
3-cell: 9.6V
4-cell: 12.8V
5-cell: 16V
6-cell: 19.2V
7-cell: 22.4V
8-cell: 25.6V
9-cell: 28.8V
10-cell: 32V
11-cell: 35.2V
12-cell: 38.4V
3-cell: 6V
6-cell: 12V
9-cell: 18V
12-cell: 24V
15-cell: 30V
18-cell: 36V
21-cell: 42V
24-cell: 48V
27-cell: 54V
30-cell: 60V
33-cell: 66V
36-cell: 72V
1.8V
2.5V
3V
3.3V
5V
6V
9V
12V
15V
18V
24V
48V
100V
110V
115V
120V
127V
208V
220V
230V
240V
380V
400V
415V

Ohm's Law says:

•When 12V (twelve volts) voltage is applied to 300mΩ (three hundred milliohms) resistance, the resulting current is 40A (fourty amps).
•If a 40A (fourty amps) current is passed via 300mΩ (three hundred milliohms) resistance, its voltage drop is 12V (twelve volts).
•When a resistor passing 40A (fourty amps) drops 12V (twelve volts), its resistance is 300mΩ (three hundred milliohms).
•If 12V (twelve volts) voltage applied to a resistor results in 40A (fourty amps) current, the resistance is 300mΩ (three hundred milliohms).



This is a simple online calculator for formulas used in electronic engineering and design.

This online calculator is for reference only. I do not guarantee it to work correctly. You use this at your own risk only.