Enter any two known values and click calculate to get the third.
This online calculator helps you quickly compute Current (I), Voltage (V), and Power (P). Simply enter any two known values, and the tool will automatically calculate the remaining one using standard electrical formulas.
The power formula P = V × I is fundamental in circuit analysis. It explains how voltage and current determine energy consumption and helps estimate device power usage accurately.
Ohm’s Law is the foundation of this calculator, describing the relationship between voltage, current, and resistance. This tool is useful for LED circuits, battery life estimation, and component protection.
With a clean and easy-to-use interface, this calculator delivers fast and accurate results, clearly displaying values and units to improve efficiency in electrical design and troubleshooting.
Voltage is the electrical potential difference that drives electric charge flow.
Power (P) = Voltage (V) × Current (I)
The unit of current is the ampere (A).
Voltage (V) = Current (I) × Resistance (R)
The unit of resistance is the ohm (Ω).
Voltage (V) = Power (P) ÷ Current (I)
Current (I) = Power (P) ÷ Voltage (V)
Electrical energy is commonly measured in watt-hours (Wh) or kilowatt-hours (kWh).
Total resistance equals the sum of all resistors (R1 + R2 + ... + Rn).
1 ÷ Total resistance = 1 ÷ R1 + 1 ÷ R2 + ... + 1 ÷ Rn
Quickly calculate current, voltage, and power for study, design, and electrical work.
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