What you provide
What you provide
- Voltage across one resistive element or equivalent network
- Resistance measured or specified for the same operating condition
ELECTRICAL / IDEAL RESISTIVE DC
Ohm's Law Calculator
Calculate current, power, and conductance from a DC voltage and resistance using the ideal steady-state form of Ohm’s law with SI symbols.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
Current is the entered voltage divided by resistance. The same ideal resistive case then gives power from voltage times current and conductance as the reciprocal of resistance.
Calculation path
Current = voltage / resistance; power = voltage x current.
What you receive
What you receive
- Calculated current in amperes
- Electrical power in watts
- Conductance in siemens and the substituted SI equation
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
This does not model AC phase, reactance, semiconductor curves, inrush, heating, tolerances, wiring protection, or safe component ratings. Use qualified electrical design for real installations.
Use consistent units and preserve more precision than the displayed result when carrying an answer into another calculation.
Reviewed reference factors