CalculatorsLesson 179Free preview
Ohm's Law Calculator
This lesson is part of Web Developer Tools · All levels
Summary
Ohm's Law Calculator calculates the relationship between voltage (V), current (I), and impedance (R) using V = I x R. Of the two known values, the third value can be calculated, and the electrical power can be searched for with P = V x I. This calculator helps design simple circuits and select safe resistors.
Key points
- Ohm's law: V is equal to I x R
- Current: I = V / R, and impedance: R = V / I
- Power: P is V x I is I^2 R is V^2 / R
- Units: volt (V), ampere (A), ohm, and watt (W)
- Select a resistor with a power rating above the calculation results
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