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Ohm's Law Calucations

Ohm's Law Calculations





Ohm's Law Factors (excluding Power)

To calculate the circuit voltage...
The formula is V = I x R
Input the
Current

Amps 		Input the
Resistance

Ohms 		 
 

  		Calculated
Voltage

Volts

To calculate the circuit amperage...
The formula is I = V / R
Input the
Voltage

Volts 		Input the
Resistance

Ohms 		 
 

  		Calculated
Current

Amps

To calculate the circuit resistance...
The formula is R = V / A
Input the
Voltage

Volts 		Input the
Current

Amps 		 
 

  		Calculated
Resistance

Ohms

Resistivity (W-cm) for Common Metals at Room Temperature
Aluminum 2.828 x 10-6
Copper 1.676 x 10-6
Silver 1.586 x 10-6
Gold 2.214 x 10-6
Tungsten 5.510 x 10-6

For example, a 10 Gauge wire is 2.588mm in diameter.
The resistance per cm of copper wire that thick is
3.186 x 10-5W/cm. A mile of this wire has a resistance of 5.13 W.