Ohm's Law & Power
The fundamental DC relationships — voltage, current, resistance, power and the logarithmic units that describe them. Seven complete tools, all live.
01
Ohm's Law Calculator
Solve for voltage, current or resistance (V = I × R).
Live 02Electrical Power Calculator
Enter any two of P, V, I, R and get the other two.
Live 03Voltage Divider Calculator
Output voltage of a 2-resistor divider, with optional load.
Live 04Wattage to dBm Converter
Power in watts ↔ dBm (1 mW reference), both ways.
Live 05Wattage to dBu Converter
Power ↔ dBu (0.775 V reference) with impedance.
Live 06Resistance Combiner
Combine resistors in series or parallel.
Live 07Resistor Power Dissipation
Power a resistor dissipates + recommended rating.
Live