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Ohms Law Calculator FullScreen

Calculate voltage, current, or resistance based on the known values using Ohm's Law equation. Ideal for electrical circuit analysis and troubleshooting. Obtain accurate results for voltage (V), current (I), or resistance (R) using this convenient online tool.


AC Ohm's law calculator

Calculate voltage, current, or impedance (reactance) in an AC circuit based on known values using the principles of Ohm's Law for alternating current (AC). Ideal for analyzing and troubleshooting AC circuits. Obtain accurate results for voltage (V), current (I), or impedance (Z) using this convenient online tool.

Impedance (Z):
∠ °  = 
Current (I):
∠ °    
Voltage (V):
∠ °    
Power (S):
∠ °  = 


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what is Ohms Law Calculator

Ohm's Law is a fundamental principle in electrical engineering that relates voltage (V), current (I), and resistance (R) in an electrical circuit. The Ohm's Law formula is as follows:

V = I * R

This formula states that voltage (V) is equal to the product of current (I) and resistance (R).

To calculate values using Ohm's Law, you can use an Ohm's Law calculator. Here's how you can use it:

  1. To find voltage (V):

    • Input the current (I) in amperes (A).
    • Input the resistance (R) in ohms (Ω).
    • The calculator will give you the voltage (V) in volts (V).

  2. To find current (I):

    • Input the voltage (V) in volts (V).
    • Input the resistance (R) in ohms (Ω).
    • The calculator will give you the current (I) in amperes (A).

  3. To find resistance (R):

    • Input the voltage (V) in volts (V).
    • Input the current (I) in amperes (A).
    • The calculator will give you the resistance (R) in ohms (Ω).

Using an Ohm's Law calculator helps simplify calculations and allows you to quickly determine the relationships between voltage, current, and resistance in an electrical circuit.

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):

I =
VR

Example

I =
20V10Ω
= 2A

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 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|) ∠ (θI + θZ)

The complex power S in volt-amps (VA):

S(VA) = (|V|×|I|) ∠ (θV - θI)

Ohms Law Calculator example

Certainly! Ohm's Law relates the voltage (V), current (I), and resistance (R) in an electrical circuit. The formula is:

V = I * R

I = V / R

R = V / I

Here's an example that demonstrates using Ohm's Law:

Let's say we have a circuit with a voltage of 12 volts and a resistance of 4 ohms. We want to calculate the current flowing through the circuit.

Using Ohm's Law: I = V / R I = 12 V / 4 Ω I = 3 Amps

Therefore, the current flowing through the circuit is 3 amps.

This calculation can be used to find any of the three parameters (voltage, current, or resistance) as long as you have values for the other two parameters.