Top

Ohms Law Calculator
Top
The Ohms Law States that the current flowing in a conductor is directly proportional to the potential difference across its ends, provided the physical condition and temperature remains constant. If a current I flows in a conductor when the potential difference across its ends is V.

So, according to Ohmâ€™s law, $\frac{V}{I}$ = constant. If the constant in the equation is equal to R, the resistance of conductor then V = IR. Here, R is constant at a given temperature for the given conductor. If I = 1, then V = R.
Thus, resistance of a conductor is numerically equal to the potential difference across its ends when unit current flows through it.

The S.I unit of potential difference is volt,(V), of current is ampere (A) and of resistance is Ohm.
Ohm = $\frac{V}{A}$.
Thus, the resistance of a conductor is said to be 1 Ohm, if 1 ampere current flows through it, when the potential difference across its ends is 1 volt.
Ohms Law Calculator calculates the voltage, current and resistance, if any of these parameters are missing by using the formula:
V = IR
Where V = Voltage
I = Current
R = Resistance

Ohms Law Calculator also calculates power, voltage, current and resistance if any two of these parameters are given. We can calculate using the formula
P = I2R
Where P = power
I = current
R = Resistance.

## Steps for Ohms Law Calculator

Step 1 :

Observe the given two parameters with units.

Step 2 :

If you need to calculate voltage (or) current (or) resistance, then use any of the below formulas:

Voltage(V) = IR

Current(I) = $\frac{V}{R}$

Resistance(R) = $\frac{V}{I}$

Where V = Voltage

I = Current

R = Resistance

If you need to calculate power (or) voltage (or) current (or) resistance, then use any of the below formulas:

Power(P) = I2 R

Current(I) = $\sqrt{\frac{P}{R}}$

Resistance(R) = $\frac{P}{R^{2}}$

Where P = Power

I = Current

R = Resistance.

## Problems on Ohms Law Calculator

1. ### A wire is having potential difference of 5 volt is carrying current of 3 A, then calculate it's resistance?

Step 1 :

Given that:

Voltage(V) = 5 volts

Current(I) = 3 A

Resistance(R) = ?

Step 2 :

We know that:

Resistance(R) = $\frac{V}{I}$

Resistance(R) = $\frac{5}{3}$

Resistance(R) = 1.6667 ohms

Resistance(R) = 1.6667 ohms

2. ### A circuit produces 300 watts output with current of 5A, then calculate it's resistance?

Step 1 :

Given that:

power(P) = 300 watts

Current(I) = 5 A

Resistance(R) = ?

Step 2 :

We know that:

Resistace(R) = $\frac{P}{I^{2}}$

Resistace(R) = $\frac{300}{5^{2}}$

Resistace(R) = 12 ohms