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Calculator - Ohm's Law

Article Details

Last Updated
7th of October, 2018

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With Ohm's Law we can make calculations to quantify the power, voltage, current, and resistance in renewable energy systems.

Above is a handy chart showing all of the inter-relationships between power, current, voltage, and resistance.

[ V ] is measured in Volts.
[ R ] is measured in Ohms.
[ I ] is measured in Amps.
[ P ]is measured in Watts,

DC calculation:
Voltage (V) calculation from current (I) and resistance (R):
V(V) = I(A) R(Ω),
Complex power (S) calculation from voltage (V) and current (I):
P(W) = V(V) I(A) = V 2(V) / R(Ω) = I 2(A) R(Ω),

AC calculation:
The voltage V in volts (V) is eqaul to the current I in amps (A) times the impedance Z in ohms (Ω):
V(V) = I(A) Z(Ω) = (|I||Z|) ∠ (θI + θZ),
The complex power S in volt-amps (VA) is equal to the voltage V in volts (V) times the current I in amps (A):
S(VA) = V(V) I(A) = (|V||I|) ∠ (θV - θI),

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