Yageo RC / CFR families
Useful when Ohm's law results point to standard resistor values for volume sourcing.
Core electrical calculatorV + R
Ohm's Law Calculator
Solve voltage, current, resistance, and power instantly from any two known electrical values with unit conversion built in.
Choose the two known values, then calculate the missing electrical parameters and use the result for sourcing decisions.
Formula map
Solve common V, I, and R relationships fast
Known values
Pick the formula mode, enter any two known values, and the calculator will solve the missing parameters instantly.
Solved output
V + RPrimary result
36.36 mA
This operating point gives 12 V, 36.36 mA, 330 Ohm, and 436.4 mW, which is useful for resistor selection, power checks, and load validation.
Voltage
12 V
Current
36.36 mA
Resistance
330 Ohm
Power
436.4 mW
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Convert calculation output into component search
Use the solved resistance and power values to search for matching parts or move straight into quotation workflows.
Suggested query
330 Ohm resistor 436.4 mW
Escalate to sourcing
Need a broader circuit-level review?
Use RFQ and quick-quote workflows when a simple Ohm's law result turns into actual component selection.
SMD / Axial
Vishay CRCW / MRS
Good fit when you need broader package or power options after calculating resistance and wattage.
Bourns current-sense options
Helpful for low-ohm and current-related calculations in power and monitoring circuits.
Ohm's law reference
What is Ohm's law?
An Ohm's law calculator helps engineers and technicians solve voltage, current, resistance, and power from any two known values. It is one of the most common entry-point calculations in electronics design, troubleshooting, and education.
Beyond the base formula V = I x R, the same relationship is used to estimate resistor values, verify expected current draw, and check whether a component's power rating is adequate for the operating point.
Ohm's law formula and unit conversion
Core formula
V = I \times R,\ I = \frac{V}{R},\ R = \frac{V}{I},\ P = V \times I
| Use case | Formula | Typical goal |
|---|---|---|
| Known voltage and resistance | I = V / R | Find current draw |
| Known voltage and current | R = V / I | Size a resistor |
| Known current and resistance | V = I x R | Check voltage drop |
FAQ
Frequently asked questions about Ohm's law
What two values do I need to use Ohm's law?
Any two of voltage, current, and resistance are enough to solve the third value and then derive power.
How do I calculate resistor power dissipation?
Use P = V x I, or equivalently P = I squared times R, depending on the values you already know.
When is Ohm's law not enough by itself?
It does not cover non-linear devices, transient effects, temperature drift, or switching behavior by itself.