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Ohm's Law Calculator
Enter any two values to calculate the others.
V
A
ฮฉ
W
Ohm's Law: V = I ร R
Voltage
โ
Current
โ
Resistance
โ
Power
โ
Formulas
V = I ร R
I = V รท R
R = V รท I
P = V ร I
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How to Use Ohm's Law Calculator
- Enter any two known values
- Click "Calculate"
- View all calculated values
- Use Clear to start over
Common Applications
- LED Circuits - Calculate current-limiting resistors
- Power Supplies - Determine voltage drops
- Electronics - Design and troubleshoot circuits
- Electrical Work - Calculate loads and wire sizing
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Frequently Asked Questions
What is Ohm's Law?
Ohm's Law states that V = I ร R, where V is voltage (volts), I is current (amps), and R is resistance (ohms).
How do I calculate current?
Current (I) = Voltage (V) รท Resistance (R). Enter voltage and resistance to find current.
What is power in circuits?
Power (P) = V ร I, measured in watts. It's the rate of energy transfer in a circuit.
What are common resistance values?
Common resistors: 100ฮฉ, 1kฮฉ, 10kฮฉ. LEDs typically need 220-470ฮฉ current-limiting resistors.