Ohm's law
Calculate voltage, current, resistance and power.
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Ohm's Law Calculator
Calculate voltage, current, resistance and power from two known electrical values.
About this calculator
How to use it
Choose the two values you know, then enter them to calculate the remaining Ohm's law quantities.
Understanding the result
Use realistic component ratings and allow suitable margins for heat, current and voltage when designing radio power and accessory circuits.
More ham radio calculators
Use this calculator as a practical starting point. Check critical radio, electrical and installation work with suitable test equipment and current licence requirements.