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
Wire and winding calculations:
Calculate Ohm's Law: 12V, 3Ω, 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:
Standard EIA Decade Values of resistors - decade 1 to 10 Ω
| E6 | E12 | E24 |
|---|---|---|
| 1.0 Ω 1.5 Ω 2.2 Ω 3.3 Ω 4.7 Ω 6.8 Ω | 1.0 Ω, 1.2 Ω 1.5 Ω, 1.8 Ω 2.2 Ω, 2.7 Ω 3.3 Ω, 3.9 Ω 4.7 Ω, 5.6 Ω 6.8 Ω, 8.2 Ω | 1.0 Ω, 1.1 Ω, 1.2 Ω, 1.3 Ω 1.5 Ω, 1.6 Ω, 1.8 Ω, 2.0 Ω 2.2 Ω, 2.4 Ω, 2.7 Ω, 3.0 Ω 3.3 Ω, 3.6 Ω, 3.9 Ω, 4.3 Ω 4.7 Ω, 5.1 Ω, 5.6 Ω, 6.2 Ω 6.8 Ω, 7.5 Ω, 8.2 Ω, 9.1 Ω |
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 3Ω (three ohms) resistance, the resulting current is 4A (four amps).•If a 4A (four amps) current is passed via 3Ω (three ohms) resistance, its voltage drop is 12V (twelve volts).
•When a resistor passing 4A (four amps) drops 12V (twelve volts), its resistance is 3Ω (three ohms).
•If 12V (twelve volts) voltage applied to a resistor results in 4A (four amps) current, the resistance is 3Ω (three ohms).
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.