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General Information, Facts & Tables
[DC Ohms Law Calculator]

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Page Topics:

Overview

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Ohm's Law is used in calculating the relationship of current, power, resistance, and voltage in direct current circuits.

See Also: Open Another, Using the Calculators
 

Formula

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Required

Known

I & P

I & R

I & V

P & R

P & V

R & V

P

-

 P = I2 * R

 P = I * V

-

-

 P = V2 / R

V

 V = P / I

 V = I * R

-

V = (P * R)0.5

-

-

R

R = P / I2

-

R = V / I

 

R = V2 / P

-

I

-

-

-

I = (P / R)0.5

 I = P / V

 I = V / R

 

Units

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I = Current (amps [A])
P = Power (watts [W])
R = Resistance (Ohms [W])
V = Voltage (volts [V])
 

Calculator

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Show all available units

I []:

   

P []:

 

R []:

 

V []:

 

Note! Set unit values prior to calculating.
 

Notes

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The "Symbol" font is required to view the symbol for Ohms. "(W)"