Ohm's Law Calculator

Online ohm's law calculator: calculates voltage / current / resistance / power.

• DC Ohm's law calculator
• AC Ohm's law calculator

DC Ohm's law calculator

Enter 2 values to get the other values and press the Calculate button:

	Resistance:	R	=		ohms (Ω) kilo-ohms (kΩ) mega-ohms (MΩ)
	Current:	I	=		micro-amps (μA) milli-amps (mA) amps (A) kilo-amps (kA) mega-amps (MA)
	Voltage:	V	=		micro-volts (μV) milli-volts (mV) volts (V) kilo-volts (kV) mega-volts (MV)
	Power:	P	=		micro-watts (μW) milli-watts (mW) watts (W) kilo-watts (kW) mega-watts (MW)

DC calculation

Voltage (V) calulation 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 Ohm's law calculator

Enter 2 values to get the other values and press the Calculate button:

	Impedance:	Z	=		Ω kΩ MΩ	∠		°	=
	Current:	I	=		μA mA A kA MA	∠		°
	Voltage:	V	=		V kV MV	∠		°
	Power:	S	=		VA kVA MVA	∠		°	=

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|) ∠ (θ_I + θ_Z)

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|) ∠ (θ_V - θ_I)

 

Ohm's law ►

 

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See also

• Ohm's law
• Voltage divider calculator
• Power calculator
• Power factor calculator
• Amps to Volts calculator
• Electrical calculators
• Resistance
• Electric current
• Electric voltage

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