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Page Topics: Top of Page Overview Formula Units Calculator Notes Bottom of Page
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
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
I = Current (amps [A]) P = Power (watts [W]) R = Resistance (Ohms [W]) V = Voltage (volts [V])
Calculator
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I []:
P []:
R []:
V []:
Note! Set unit values prior to calculating.
Notes
The "Symbol" font is required to view the symbol for Ohms. "(W)"
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