Ohm’s Law Calculator

Ohm’s Law Calculator

 


Current
Voltage
Resistance

Definition

Ohms Law states that the current passing or flowing through the conductor between two points is directly proportional to the potential difference that is applied across the two points. The electric current on the other hand is inversely proportional to the resistance between the points.

As the resistance in a circuit increases, the current generated in the circuit decreases.

The resistor’s voltage drop and resistance set the DC current flow through the resistor.

E.g. – the current, I flowing through a circuit with resistance, R and terminal of voltage, V

Formula

According to Ohm’s law, the resistor’s current is equal to the resistor’s voltage divided by the resistance :

Current(A)[I] = Voltage(V)[V]   ⁄   Resistance(Ω)[R]

Example:

1. Calculate the current through resistor of resistance 2 Ω and voltage across resistor is 10 V ?

Sol. :

I = V / R

I = 10(v) / 2(Ω)

I = 5 A

Current = 5 Ampere

2. Calculate the voltage across a resistor of resistance 3 Ω and current through resistor is 5 A ?

Sol. :

I = V / R

V = I * R

V = 5(A) * 3(Ω)

V = 15 (v)

Voltage = 15 volt

Units

The standard unit of Current is Amperes i.e Volt / Ohm

One Ampere is the amount of current flowing through a resistor of 1 Ohm and voltage across the resistor is 1 volt.