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Electronics & Hardware Engineering

Ohm's Law Calculator — Voltage, Current, Resistance & Power

V = I × R; P = V × I = I²R = V²/R.

Solve for voltage, current, resistance, and power in DC circuits. Planning estimates only — verify with production tools and vendor pricing where applicable.

Inputs

0.11000
0.001100

Smart analysis

Recommendations

Tailored to your live inputs and result—guidance only, not professional advice.

  • Interpret

    Treat this as a planning estimate

    Primary result: Resistance = 6.00 Ω. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.

Scenario studio

Compare A vs B

Capture two sets of inputs on this device, then see which outcome wins. Share either scenario with a link.

Scenario A

Adjust inputs, then capture this slot.

Scenario B

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Plain-English guide

Terms & how it works

Confused by a field? Read the short definitions here while you use the tool.

  • Voltage (V)

    The “Voltage (V)” value used in this tool’s formula. Adjust it to see results update live.

  • Current (A)

    The “Current (A)” value used in this tool’s formula. Adjust it to see results update live.

How this calculator works

Solve for voltage, current, resistance, and power in DC circuits. Planning estimates only — verify with production tools and vendor pricing where applicable. V = I × R; P = V × I = I²R = V²/R. Example: 12 V, 2 A → 6 Ω resistance, 24 W power.

V = I × R; P = V × I = I²R = V²/R.

Example: 12 V, 2 A → 6 Ω resistance, 24 W power.

When to use this Ohm's Law

Common use cases

  • Solve for voltage, current, resistance, and power in DC circuits.
  • Sanity-check with this case: 12 V, 2 A → 6 Ω resistance, 24 W power.
  • The relationship is: V = I × R; P = V × I = I²R = V²/R.

Localized examples

  • Electronics & Hardware Engineering: the example on this page uses the same formula as the widget.

What you get

  • Fields: Voltage (V), Current (A)
  • V = I × R; P = V × I = I²R = V²/R.
  • Example on the page: 12 V, 2 A → 6 Ω resistance, 24 W power.

How to Calculate Ohm's Law Step-by-Step

  1. 1Enter Voltage (V), Current (A). Use the values you have, not a catalog average, unless that is all you know.
  2. 2V = I × R; P = V × I = I²R = V²/R.
  3. 3Worked case: 12 V, 2 A → 6 Ω resistance, 24 W power.
  4. 4Compare the result to last month’s invoice or a vendor calculator before you commit capacity.

Governing formula

V = I × R; P = V × I = I²R = V²/R.

12 V, 2 A → 6 Ω resistance, 24 W power.

Example: set Voltage (V) = 12, Current (A) = 2, then read the result.

Variable definitions

  • voltage

    Voltage (V)

    The “Voltage (V)” field. Default 12; typical range 0.1–1000.

  • current

    Current (A)

    The “Current (A)” field. Default 2; typical range 0.001–100.

  • Closed-form math (V = I × R; P = V × I = I²R = V²/R.) misses idle time, egress, packet loss, and reserved capacity on the real bill.
  • Nothing here is uploaded for the calculation itself.

Frequently Asked Questions

V = I × R; P = V × I = I²R = V²/R.

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Reviews & Ratings

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4.8

out of 5.0

4 reviews

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Your rating

Aisha K.

Mar 12, 2026

Clean layout and the results update instantly. Exactly what I needed for a quick planning check.

Daniel R.

Feb 28, 2026

Very usable on mobile. Would love a save/export option later, but the math feels solid.

Priya S.

Feb 3, 2026

The FAQ section answered my questions before I even had to search. Smooth dark mode too.

Marcus L.

Jan 19, 2026

Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.

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