Ohm's Law Calculator
Voltage Unit
Current Unit
Resistance Unit
Calculating...
Ohm's Law Calculation Result
Result will appear here
V = I × R
0 V
Voltage
0 A
Current
0 Ω
Resistance
Calculating...
Power Calculation Result
Result will appear here
P = V × I = I² × R = V² / R
0 V
Voltage
0 A
Current
0 W
Power
Calculating...
Series Resistance Result
Result will appear here
R_total = R1 + R2 + R3 + R4
Series Circuit Diagram
Calculating...
Parallel Resistance Result
Result will appear here
1/R_total = 1/R1 + 1/R2 + 1/R3 + 1/R4
Parallel Circuit Diagram
About 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. It is usually formulated as:
V = I × R
Where:
- V = Voltage (volts)
- I = Current (amps)
- R = Resistance (ohms)
Power in Electrical Circuits
Power in electrical circuits can be calculated using:
- P = V × I
- P = I² × R
- P = V² / R
Series and Parallel Circuits
Series Circuits: The total resistance is the sum of all individual resistances:
R_total = R1 + R2 + R3 + ...
Parallel Circuits: The reciprocal of the total resistance is the sum of the reciprocals of all individual resistances:
1/R_total = 1/R1 + 1/R2 + 1/R3 + ...
Usage Instructions
- Select the appropriate tab for your calculation
- Enter at least two known values
- Click the calculate button to get results
- Use the interactive sliders to visualize relationships
- Hover over info icons for additional guidance