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:
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
Tungsten
5.60 × 10^{-8}
0.0045
Zinc
5.90 × 10^{-8}
0.0037
Nickel
6.99 × 10^{-8}
0.006
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