online electronic calculator - Ohm's law and much more

DC power 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, Bandwidth ↔ rise time

Wire and winding calculations:

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

Calculate DC power: 5V, 2A, W


Using this calculation, you can calculate the power of a DC load knowing the voltage and current. You can also calculate the current knowing the power and voltage, and finally, calculate the voltage knowing the power and current.   P=V.I   I=P/V   V=P/I

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

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

Some common voltages:

Alkaline
Zinc-Carbon
NiMH, NiCd
rechargeable
Li-Ion
3.6V
Li-Ion
3.7V
Li-Ion
full 4.2V
LiFePO4
(LFP) 3.2V
Lead-acid
battery
Power
supply
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: 4.2V
2-cell: 8.4V
3-cell: 12.6V
4-cell: 16.8V
5-cell: 21V
6-cell: 25.2V
7-cell: 29.4V
8-cell: 33.6V
9-cell: 37.8V
10-cell: 42V
11-cell: 46.2V
12-cell: 50.4V
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

DC power formula says:

•When a DC load (or a resistive AC load) draws 2A (two amps) current at 5V (five volts) voltage, it's power input is 10W (ten watts).
•If a 5V (five volts) load draws 10W (ten watts) power, its current consumption is 2A (two amps).
•When a load runs at 2A (two amps) current at 10W (ten watts) power input, its voltage is 5V (five volts).



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.