Search Share

Ohms Law Calculator

Calculate voltage/current/resistance/power.

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

Voltage (V)

microvolts (μV) millivolts (mV) volts (V) kilovolts (kV) megavolts (MV)

Current (I)

microamps (μA) milliamps (mA) amps (A) kiloamps (kA) megaamps (MA)

Resistance (R)

ohms (Ω) kiloohms (kΩ) megaohms (MΩ)

Power (P)

microwatts (μW) milliwatts (mW) watts (W) kilowatts (kW) megawatts (MW)

  = Calculate × Reset

Calculation

• Ohm's law with examples
• Voltage divider
• Watts to amps

Ohm's law calculation formula

The current I in amps (A) is equal to the voltage V in volts (V) divided by the resistance R in ohms (Ω):

Example

The power P in watts (W) is equal to the voltage V in volts (V) times the current I in amps (A):

P = V × I

Example

P = 20V × 2A = 40W

AC Ohm's law calculator

Enter 2 values of magnitude+phase angle 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	∠		°	=
= Calculate × Reset

AC Ohm's law calculation formula

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):

S_(VA) = (|V|×|I|) ∠ (θ_V - θ_I)

 

Ohm's law ►

 

---

See also

• Ohm's law
• Voltage divider
• Watts to amps
• kW to amps
• Resistance
• Electric current
• Electric voltage
• Complex numbers calculator

Write how to improve this page

Submit Feedback