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Electronics & Hardware Engineering

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

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

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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.

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.

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

V = I × R; P = V × I = I²R = V²/R.

Scenario: 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 scenario: 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.
  • Scenario on the page: 12 V, 2 A → 6 Ω resistance, 24 W power.

How to Calculate Ohm's Law

  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. 3Scenario: 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.

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

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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