Ohm's Law Calculator with Power
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Ohm's Law Calculator with Current, Resistance and Power
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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 = I2 * R
Where:
V: Voltage, in Volts (V)
R: Resistance, in ohms (Ω)
I: Current, in Amps (A)
P: Power, in J
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 × 102 |
-0.075 |
