If you are in electrical engineering and electronics, then you’ll be familiar with **Ohm’s Law**. **Ohm’s law** is about understanding current, resistance, and voltage with a conductor. The calculation process is crucial in most electrical industries, but it can be hard work.
If you need a helping hand, then an **Ohm’s Law calculator** will be more help than you think. Below, you can learn how to use it and the Ohm’s Law formula. You can read about the equation for power, how to calculate it, and how to use a voltage formula.

In physics, **Ohm’s Law** is one of the basic rules. It provides meaning for amperage, current, resistance, and voltage. Understanding these terms are crucial. Voltage is the difference between two points in an electrical field. Amperage is an electrical charge carrier’s flow. Last is resistance. Resistance is the opposition to an electric current flow.
When you involve Ohm’s Law, you know the flow through a conductor is relative to the voltage between that conductor’s ends.
*I / V = const*
With the **Ohm’s Law formula**, you can work out the resistance as being the quotient of current and voltage. The method is below.
*R = V / I*
R = resistance
V = voltage
I = current
When you refer to resistance, you express it in the unit of Ohms, a unit named for physicist Georg Ohm. Ohm’s Law formula also only includes substances or materials that induce power. You can’t use it for isolators or even semiconductors.

The voltage formula is not dissimilar to **Ohm’s Law**. It uses one of the math equations of Ohm’s Law.
*V = IR, where you measure the value in volts*

Along with voltage and resistance, you can use Ohm’s Law for power. Power is the product of current and voltage.
*P = V x I*
When you use this formula, you can determine the power level of almost anything, such as a lightbulb. All you need to know is the voltage and current. Let’s say a lightbulb has a five-amp current and a 20-volt voltage.
*Power = 20 x 5 = 100 watts*

You use both Ohm’s Law formula and a power formula to get results in an Ohm’s Law calculator. To use the tool, you have to know the voltage and current.
Once you enter the data, you get the resistance in Ohms and power in watts.