Can I use milliamps or kilohms?
Yes—pick alternate units from the select inputs and the calculator handles conversions internally.
Step-by-step walkthrough
Ohm’s Law Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- ohms law
- voltage
- current
Detailed procedure
Step 1
Select which value to solve for.
Step 2
Enter the known quantities using volts, amps, and ohms.
Step 3
Read the solved value plus instantaneous power and unit-scaled outputs.
Teaching & troubleshooting tips
Does it support AC impedance?
This tool focuses on DC circuits. Use the Power Factor calculator for AC efficiency considerations.