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Ohm's Law Calculator


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

Ohm's Law Calculator with Power


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