Ohm’s Law Calculator
Calculate voltage, current, resistance, and power in electrical circuits instantly with our free online Ohm’s Law calculator. Perfect for students, engineers, and electronics hobbyists.
Input Values
Calculation Results
Ohm’s Law Visualization
Voltage vs. Current Relationship
Understanding Ohm’s Law
What is Ohm’s Law?
Ohm’s Law is a fundamental principle in electrical engineering and physics that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.
Where:
- V is the voltage in volts (V)
- I is the current in amperes (A)
- R is the resistance in ohms (Ω)
Ohm’s Law Formulas
Ohm’s Law can be rearranged to solve for any of the three variables:
Additionally, electrical power can be calculated using these formulas:
Applications of Ohm’s Law
Ohm’s Law is used in various electrical and electronic applications:
- Circuit Design: Determining component values in electronic circuits
- Troubleshooting: Identifying problems in electrical systems
- Power Management: Calculating power consumption and heat dissipation
- Safety Analysis: Ensuring electrical systems operate within safe parameters
- Education: Teaching fundamental electrical concepts
Frequently Asked Questions
Ohm’s Law is used to calculate the relationship between voltage, current, and resistance in electrical circuits. It helps engineers and technicians design circuits, troubleshoot electrical problems, and ensure systems operate safely and efficiently.
Power (P) in an electrical circuit can be calculated using Ohm’s Law with the formula P = V × I, where V is voltage and I is current. This can also be expressed as P = I² × R or P = V² / R, where R is resistance.
The standard units in Ohm’s Law are:
- Voltage (V) – measured in volts (V)
- Current (I) – measured in amperes (A)
- Resistance (R) – measured in ohms (Ω)
- Power (P) – measured in watts (W)
Ohm’s Law applies to “ohmic” materials, which have a constant resistance regardless of the voltage or current. Some materials, like semiconductors and diodes, are non-ohmic and don’t follow Ohm’s Law exactly.
Our Ohm’s Law calculator provides highly accurate calculations based on the standard formulas. For precise engineering applications, always consider factors like temperature, material properties, and component tolerances that might affect real-world results.
Conclusion
Ohm’s Law is an essential principle for anyone working with electrical circuits. Our Ohm’s Law calculator simplifies these calculations, making it easy to determine voltage, current, resistance, and power in any circuit. Whether you’re a student learning electronics, an engineer designing circuits, or a hobbyist working on DIY projects, this tool provides accurate results instantly.
Understanding and applying Ohm’s Law correctly is crucial for designing safe and efficient electrical systems. With this calculator, you can quickly verify your calculations and explore how changing one parameter affects the others in a circuit.
For more complex circuits or advanced electrical calculations, consider using our other electrical engineering calculators available on our website.