Ohm’s Law Calculator
Ohm’s Law Calculator – Easily Calculate Voltage, Current, Resistance, and Power
Looking for a fast and simple way to solve Ohm’s Law equations? Our Ohm’s Law Calculator is here to help! Just enter any two values, click “Calculate,” and instantly get the remaining values for voltage (V), current (I), resistance (R), and power (P).
Input Options:
Voltage (V):
- kilovolts [kV]
- volts [V]
- millivolts [mV]
Current (I):
- amperes [A]
- milliamperes [mA]
Resistance (R):
- ohms [Ω]
- kilohms [kΩ]
- megohms [MΩ]
Power (P):
- watts [W]
- kilowatts [kW]
- megawatts [MW]
- horsepower
- BTU/hr
How Does Ohm’s Law Work?
Ohm’s Law explains the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. It states that the current through a conductor is directly proportional to the voltage, as long as the resistance stays the same. This principle works for resistive circuits with DC (direct current) or AC (alternating current) systems.
Ohm’s Law Formulas:
- Voltage (V) = Current (I) × Resistance (R)
- Resistance (R) = Voltage (V) ÷ Current (I)
- Current (I) = Voltage (V) ÷ Resistance (R)
Where:
- V = Voltage in volts
- I = Current in amperes
- R = Resistance in ohms
Understanding Electrical Power
Electrical power refers to the rate at which energy is transferred in a circuit, measured in watts (W). Power can be calculated using Joule’s Law, combined with Ohm’s Law, to find the power dissipated in a resistive circuit:
- P = Voltage (V) × Current (I)
- P = Voltage² (V²) ÷ Resistance (R)
- P = Current² (I²) × Resistance (R)
Where:
- P = Power in watts
Ohm’s Law Formula Wheel
The Ohm’s Law Formula Wheel visually represents the relationship between power (P), current (I), voltage (V), and resistance (R). Choose the variable you want to solve for, and use the formulas to find the answer!
Why Use an Ohm’s Law Calculator?
Our calculator simplifies the process of solving electrical equations, saving you time and effort. Whether you’re an engineer, student, or hobbyist, this tool is perfect for quickly analyzing circuits and understanding key electrical principles.