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DC Resistor Wattage Calculator — result sheet
Solve a single-resistor DC circuit from any selected pair of voltage, current, and resistance values, then show dissipated power and a visible planning margin.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Ohm's law: V = I×R; power P = V×I = I²×R = V²/R; one-hour energy at constant load = P Wh.
The worksheet chooses one of three known pairs, solves the missing electrical quantity, and reports the resulting DC power. It also displays two times the calculated power as a deliberately labelled planning starting point, not as a universal component-rating rule.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Known electrical pair — 3 choices
- Voltage — V; minimum 1.0E-6; maximum 1000000000
- Current — A; minimum 1.0E-6; maximum 1000000000
- Resistance — Ω; minimum 1.0E-6; maximum 1000000000000
Worked example
| Input | Value |
|---|---|
| Known electrical pair | voltage-resistance |
| Voltage | 12 |
| Current | 0.5 |
| Resistance | 24 |
The solved current is 0.5 A and the resistor dissipates 6 W; the visible two-times planning value is 12 W.
Assumptions and limits
- The circuit is represented by one linear resistor in a steady DC scenario.
- Voltage, current, and resistance are positive magnitudes in compatible SI units.
- The selected pair is treated as the measured or specified pair; the unused field is not used to solve the circuit.
- The power result is electrical dissipation in the resistor, not useful mechanical or stored energy.
- One-hour energy assumes the calculated power stays constant for one hour.
- The displayed two-times value is a conservative starting margin and is not a datasheet recommendation.
- Temperature coefficient, pulses, AC power factor, heat sinking, and enclosure conditions are not modelled.
- A real circuit must be isolated and checked against component and system safety requirements.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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