🎓 Engineering • Electrical Engineering
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Ohm’s Law & DC Power Calculator
Solves Ohm’s law wheel relationships with automated power dissipation calculations.
Ohm’s Law & DC Electrical Power Calculator
Select any 2 known electrical parameters to dynamically solve for the remaining 2 variables
Real-World Electrical Presets
Dynamic DC Circuit Schematic & Measurement Probes
Voltage (V)
12 V
KnownCurrent (I)
2 A
I = V / R = 12 / 6 = 2 AResistance (R)
6 Ω
KnownPower (P)
24 W
P = V² / R = 12² / 6 = 24 WWhat is Ohm’s Law?
Ohm’s Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to resistance.
Formula & Step-by-Step Calculation
V = I · R, P = V · I = I² · R = V² / R
Ohm’s law and Joule’s heating power dissipation.
Worked Step-by-Step Examples
Example 1
A 12V automotive battery powers a 6Ω resistor. Find current and power.
Solution: Current I = 2.00 A, Power P = 24.00 W
• I = 12 / 6 = 2.00 A; P = 12 × 2 = 24.00 W
Common Real-World & Academic Use Cases
- ✓ Sizing resistors for LED current limiting
- ✓ Automotive 12V DC auxiliary wiring design
- ✓ Electronic circuit prototyping breadboard testing
How to Use the Ohm’s Law & DC Power Calculator
1
Enter Known Parameters
Input any two values (e.g. Voltage and Resistance).
2
Read Current & Power
Review calculated current in Amperes and dissipated wattage.
Frequently Asked Questions
Q: Does Ohm’s law apply to AC circuits?
Yes, but resistance is replaced by impedance (Z), taking capacitive and inductive reactance into account.