For certain conductors of electricity, the electric current which will pass through them is directly proportional to the voltage applied to them. It is found to depend upon the fact that the drift velocity of charges through the material is proportional to the electric field in the conductor. The resistance is the ratio of voltage to current, and if the ratio remains constant over a broad range of voltages, the material is said to be "ohmic." If the resistance of a substance can be determined, the current can be predicted using a relationship, which is Ohm's Law. And Ohm Calculator and Voltage Divider Calculator are Resistance Calculators.
Overview of Ohms Law Calculator
This Ohms calculator is a handy online conversion tool for figuring out the relationships between voltage, current, and resistance across a conductor. In electrical engineering and electronics, the Ohm's law formulas and the voltage formula are commonly employed. Also, knowing how to calculate power might come in handy while studying electronic circuits. Ohm's Calculator can help you with all of these online ohms law calculations.
Ohm's Law Explanation
What is Ohms Law?
If all physical parameters and temperature stay constant, Ohm's law asserts that the voltage across a conductor is precisely proportional to the current flowing through it. And resistance is the constant of proportionality in the equation, with units of ohms and the sign R.
How Does Ohms Law Work?
When a distinct electric potential (voltage) is supplied at either end of a resistance, Ohm's law defines how current flows through it. This may be compared to water running through a conduit. The water pressure is represented by the voltage, the current by the amount of water flowing through the pipe, and the resistance by the pipe size. The more pressure (voltage) supplied to the pipe, and the larger the pipe is, the more water will flow through it (current) (lower the resistance).
Ohms law Formulas
One of the fundamental rules of physics is Ohm's Law. The link between voltage, amperage (also known as current), and resistance is described. The potential difference between two places in an electrical field is referred to as voltage. The flow of electrical charge carriers, generally electrons or electron-deficient atoms, is measured in amperage. The last term, resistance, refers to a substance's resistance to an electric current flow.
Ohm's law Formulas
The voltage V in volts (V) is equal to the current I in amps (A) times the resistance R in ohms (Ω):
V(V) = I(A) × R(Ω)
The power P in watts (W) is equal to the voltage V in volts (V) times the current I in amps (A):
P(W) = V(V) × I(A)
According to Ohms law, current flows through a conductor at a rate proportionate to the voltage between the conductor's ends. That's to say, there is no change in the connection between voltage and current:
I/V = const
The resistance may be calculated using the Ohms law formulas as the quotient of the voltage and current. It's possible to write the formula for ohms law as:
R = V/I
Where:
R - resistance
I - Current
V - voltage
The resistance is measured in ohms. Georg Ohm, the scientist and originator of Ohms law, inspired both the unit and the rule.
Keep in mind that Ohm's law only applies to things that can produce power, such as metals and ceramics. However, many other materials, such as semiconductors and insulators, cannot be calculated using the Ohms law calculation. Ohms law is only true under specific circumstances, such as a constant temperature. Check out our skin depth calculator for more information on current flow through a conductor in an AC circuit.
Looking for an example of Ohm's law in action? Don't forget to use the LED resistor calculator!
AC Ohm's law formula
The voltage V in volts (V) is equal 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) is equal to the voltage V in volts (V) times the current I in amps (A):
S(VA) = V(V) × I(A) = (|V|×|I|) ∠ (θV - θI)
Ohms Law Triangle
The Ohm's law Triangle is divided into three sections: Voltage must always be on the upper half. The bottom half is then divided into two smaller portions for current and resistance -- current is normally on the left, while resistance is on the right, although the order isn't important.
To find the Resistance, ( R )
[ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
To find the Current, ( I )
[ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
To find the Voltage, ( V )
[ V = I x R ] V (volts) = I (amps) x R (Ω)
The following permutations of the Ohms law equations can be obtained by transposing the conventional Ohm's Law equation below.
Ohms Law Triangle Rule
When looking at the Ohm's Law Triangle, remember that if the numbers are next to each other, you multiply, and if they are next to each other, you divide.
Ohms Law Wheel
A formula wheel for Ohm's Law relationships between P, I, V, and R can be found below. This is basically what the calculator does, and it's just a reflection of the equations' algebraic manipulation. To use the wheel, choose the variable to solve for in the center, then use the relationship for the two known variables within the circle's cross-section.
Ohms Law Formulas Wheel
The power (P) measured in Watts is added to Ohm's law formula wheel. In this situation, power is defined as the wattage rate at which energy is transmitted by the circuit per unit time. The PIE chart is combined with Ohms law formula wheel. There are 4 units in all.
While the ohms law formula wheel appears to be complex, it is just as simple to use as the PIE chart.
The formulas in each quadrant of the chart indicate the relationship between two variables, whether they are directly proportional or not. Inside each quadrant, you'll discover three formulas.
How to Use Ohms Law Power Wheel
When employing Ohm's law wheel, there are four steps to follow.
Step 1: Decide which variable you'll be solving for: power (P), resistance (R), amps (I), or volts (V) (E or V).
Step 2: Determine which of the following variables you are already familiar with: power (P), resistance (R), amps (I), and volts (V) (E or V).
Step 3: Locate the formula into which your two values may be plugged.
Step 4: Find the solution to the problem.
When solving the formula, be sure you use suitable units. If you're using ohms and amperes, that's okay because they work together. However, if you have kilohms, you should convert the number to ohms before calculating the answer. Otherwise, you'll obtain a lot lesser outcome than you anticipated. Using kilowatts instead of watts or milliamperes instead of amperes has the same effect.
Ohms Law Example
If you know how much a 120 Volt(E or V) light weighs, When a bulb provides 625 amps(I) of current flow, how many Ohms of resistance does it provide?
192 Ohms(R) of resistance = 120 Volts(E) divided by.625 amps(I).
What if you know the measured amps(I) of current flow and the lamp filament resistance(R)? Can you then figure out what voltage this lamp is receiving? To find your solution, use the Ohm's Law Triangle above.
The Voltage applied to the bulb is equal to the Current(I) multiplied by the Resistance(R).
How to Calculate Ohms Law
The above video will show you how to Calculate Current, Voltage, and Resistance step by step. With practice examples, learn how to calculate current, voltage, and resistance using Ohm's law.
And this YouTube video will teach you how to solve Ohms law practice problems.
V = I x R is the formula for calculating current, voltage, and resistance. The number of electrons in a current (I) is equal to the number of electrons in a circuit (measured in amps). The amount of energy carried by a charged particle is measured in voltage (V) (measured in volts). The resistance (R) of a conductor is determined by the kind of conductor employed (measured in amps).
Using Ohms law Formula, you can compute current, voltage, and resistance in 4 stages.
Step 1: make a list of the known values in the query.
Step 2: jot down the unknown value, which we will need to solve.
Step 3: jot down your ideas.
Conclusion
In conclusion, Ohms Law is not difficult to understand, yet it is critical for circuit design. The missing value may be readily determined if two of the three variables are known. This cornerstone of electrical engineering underpins the inner workings of every circuit, no matter how basic or complex.