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Current (I):
Voltage (V):
Resistance (R):

Current (I):
Voltage (V):
Power (P):

#### Ohm's Law Calculator with Current, Resistance and Power

Current (I):
Resistance (R):
Power (P):

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