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    Ohm's Law Calculator - Voltage, Current, Resistance & Power Calculations

    Created by Md jony islam

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    Simple and Fast Ohm’s Law Calculator for Circuits

    An Ohm's Law Calculator is an online tool for quickly solving electric circuit calculating parameters. Based on Ohm’s Law, 𝑉 = 𝐼 × 𝑅, the calculator computes voltage (V), current (I), resistance (R), or Real power (P) when any two values are provided. It simplifies complex value calculations in electronics, making it ideal for engineers, electricians, and students.

    Ohms Law Calculator

    Ohm's Law in Circuit

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    Ohm's Law in Voltage CircuitPower Supply+-AmmeterA-+V = 15 VR = 5 ΩP = 45 WCurrentA = 3 A© Online Works ToolsPowerResistance
    Fig-1: Ohm's Law in Voltage Circuit
    A
    • nanoamperes (nA)
    • microamperes (µA)
    • milliamperes (mA)
    • Amperes (A)
    • kiloamperes (kA)
    Ω
    • millohms (mΩ)
    • ohms (Ω)
    • Kiloohms (KΩ)
    • Megaohms (MΩ)
    • Gigaohms (GΩ)
    V
    • nanovolts (nV)
    • microvolts (µV)
    • millivolts (mV)
    • Volts (V)
    • Kilovolts (KV)
    • megavolts (MV)
    W
    • nanowatts (nW)
    • microwatts (µW)
    • milliwatts (mW)
    • Watts (W)
    • Kilowatts (KW)
    • megawatts (MW)
    • gigawatts (GW)

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    What is Ohm's Law

    As we can see from the formula, it can also be used to get the resistance and current. Any two numbers can be computed to determine the unknown variable.

    ohm's Law Formula
    Fig-1: ohm's Law Formula

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    Calculating electrical Voltage using ohm's low.

    Formula to find Voltage

    1. When the values for Current and resistance are given

    V = I × R

    2. When the values for Power and current are given

    V = PI

    3. When the values for Power and resistance are given

    V = p × R

    Calculating electrical Current using ohm's low.

    Formula to find Current

    1. When the values for Voltage and resistance are given

    I = VR

    2. When the values for Power and voltage are given

    I = PV

    3. When the values for Power and resistance are given

    I = ( PR )

    Calculating electrical Resistance using ohm's low.

    Formula to find Resistance

    1. When the values for Voltage and Current are given

    R = VI

    2. When the values for Power and voltage are given

    R = V2P

    3. When the values for Power and Current are given

    R = PI2

    Suggested Reading

    Calculating electrical Power using ohm's low.

    Formula to find Power

    1. When the values for current and resistance are given

    P = R × I2

    2. When the values for voltage and resistance are given

    P = V2R

    3. When the values for voltage and current are given

    P = V × I

    ohm's law solved problems:

    For Example-01, A circuit has a resistance (R) of 20 ohms, and the current (I) flowing through it is 2 amperes. What is the voltage (V) across the circuit?

    V = I × R
    V = 2 × 20
    V = 40v

    the voltage across the circuit is 40v.

    ohm's law solved problems (Power Calculation):

    For Example-02, If the voltage (V) is 40 volts and the current (I) is 2 amperes, calculate the power (P).

    P = V × I
    P = 40 × 2
    P = 80w

    the Power across the circuit is 80w.

    Application of Ohm’s Law

    Frequently Asked Questions - FAQs for Ohms Law

    What is Ohm's Law?

    t is a rule that makes understanding the relationship between voltage and current and resistance, in a circuit.

    Why is it called Ohm's Law?

    This relationship is named after Georg Simon Ohm, who discovered this relationship in 1827.

    How does Ohm’s law come into actual life?

    we use it in electronics like phones, computers and even cars so they all receive the right amount of power.

    If resistance is high what happens?

    Slow current is produced due to the high resistance that the current uses so much electricity couldn’t pass through the circuit.

    Can there exist a number such that you could change the resistance in a circuit?

    Yes, resistors are used in circuits to signal control or via meters on them the change of the amount of resistance between their pins.

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    About the Author

    Md Jony Islam

    Md Jony Islam

    Jony is a passionate writer and web developer. He enjoys sharing insights about technology, web development, and design. When he's not writing, he loves hiking and exploring the outdoors.