Ohm's Law Calculator

Ohm's Law Calculator with Power

Ohm's Law Calculator with Current, Resistance and Power

Ohm's Law states that the current through a conductor between two points is directly proportional to its resistance. Since current
can be measured by power and voltage, Ohm's Law shows the relationship between the voltage (V), current (I), power (P) and resistance (R).

Ohm's Law formula is:

**V = I * R**

Other two useful formulas:

**P = I * V**

**P = I ^{2} * R**

Where:

Metal Resistivity Table

Metal

Resistivity (Ω . m) at 20 °C

Temperature coefficient [K^{-1}]

Silver

1.59 × 10^{-8}

0.0038

Copper

1.68 × 10^{-8}

0.0039

Gold

2.44 × 10^{-8}

0.0034

Aluminium

2.82 × 10^{-8}

0.0039

Calcium

3.36 × 10^{-8}

Tungsten

5.60 × 10^{-8}

0.0045

Zinc

5.90 × 10^{-8}

0.0037

Nickel

6.99 × 10^{-8}

0.006

Iron

1.0 × 10^{-7}

0.005

Platinum

1.06 × 10^{-7}

0.00392

Tin

1.09 × 10^{-7}

0.0045

Lead

2.2 × 10^{-7}

0.0039

Manganin

4.82 × 10^{-7}

0.000002

Constantan

4.9 × 10^{-7}

0.000008

Mercury

9.8 × 10^{-7}

0.0009

Nichrome

1.10 × 10^{-6}

0.0004

Carbon

3.5 × 10^{-5}

-0.0005

Germanium

4.6 × 10^{-1}

-0.048

Silicon

6.40 × 10^{2}

-0.075